With over 6,400 GitHub stars, 130 contributors, and 512 releases, Flagsmith is the open-source feature flag and remote configuration platform that gives development teams granular control over feature releases, remote configuration values, user segmentation, and A/B testing from a single self-hosted dashboard. Feature flags support boolean toggles and remote config values simultaneously — every flag carries both an enabled state and a configurable value, letting teams deploy functional and visual changes without code modifications or app store approvals. User segments target audiences by attributes, percentage rollouts, and custom rules, enabling beta testing, canary releases, and gradual feature rollouts with real-time toggle control. Multivariate flags split traffic across multiple variations with configurable percentage weights for A/B and multivariate testing with analytics integration. The flag evaluation engine runs server-side with local evaluation mode in SDKs for sub-millisecond performance without network calls, supporting 15+ languages including TypeScript, Python, Java, C#/.NET, Go, Ruby, PHP, Swift, Kotlin, Flutter, React, and Next.js. The REST API and webhooks enable integration with CI/CD pipelines, and pre-built connectors exist for Datadog, New Relic, Amplitude, Mixpanel, Segment, Heap, Rudderstack, and Slack. Built on Django with a React frontend, self-hosting deploys via Docker Compose with PostgreSQL, or via Helm charts and the OpenShift Operator for Kubernetes environments. Change history provides a complete audit trail of flag modifications. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. BSD-3-Clause licensed.

TREK coordinates group expeditions and vacations through a collaborative travel planning workspace that unifies daily itineraries, interactive route maps, shared expense budgets, and packing lists. Travel groups can build day-by-day timelines by dragging activities between dates, attaching transit bookings with flight numbers, and estimating driving intervals directly on OpenStreetMap and Mapbox canvases. Instant WebSocket synchronization mirrors itinerary edits, group chat messages, and decision poll votes across all traveling companions simultaneously without page refreshes. The integrated multi-currency expense manager tracks shared expenditures across lodging, dining, and transit categories, automatically calculating per-person debts and generating simplified debt settlement summaries. An interactive world atlas highlights visited nations and tracks lifetime travel statistics, enabling globe-trotters to manage personal bucket lists and review past journeys. Travelers can organize shared packing checklists from reusable equipment templates, monitor real-time weather forecasts powered by Open-Meteo, and export comprehensive travel schedules to printable PDF guides and calendar feeds. Role-based permission controls safeguard sensitive travel documents and boarding pass uploads while allowing guests to contribute notes and vote on activities. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.

Engineering and product teams ship code to production daily with FeatBit, an enterprise feature flag and experimentation platform that controls exactly which user segments, regions, or percentage rollouts see each new capability. When a regression appears in production, operators toggle an instant kill switch, dial back canary weights from full traffic to one percent, or restrict access to internal QA accounts without redeploying containers. Reusable user segments group customers by subscription tier, device property, or custom attributes for consistent targeting across environments. Server-side and client-side SDKs for .NET, Java, Go, Python, Node.js, React, React Native, JavaScript, and OpenFeature synchronize flag states over WebSockets in under 100 milliseconds and evaluate rules locally in memory. Built-in A/B/n experimentation links flag variations to custom conversion events, click tracking, and pageview metrics so teams can validate product hypotheses with live telemetry. Scheduled rollouts, multi-step approval workflows, flag triggers, and webhook integrations with Slack, Datadog, Grafana, New Relic, and OpenTelemetry keep release operations auditable. Role-based access control and single sign-on govern every flag change. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.

Deployment decoupled from release: Unleash, the most popular open-source feature management platform on GitHub, is a Node.js server backed by PostgreSQL. Ship code dark, then control who sees it through activation strategies: gradual percentage rollouts, targeting by user ID, IP, hostname, or application name, custom constraints against your own context fields, and scheduled or time-limited releases. Strategies stack - a flag activates if any strategy matches - and strategy variants layer A/B versions on top of the on/off decision. Each flag carries per-environment configurations, so a feature can run at 100% in staging while canarying at 5% in production. Backend SDKs (Node.js, Java, Go, Python, Ruby, .NET, PHP, Rust, and more) fetch configuration and evaluate flags locally, so a flag check adds zero network latency to request paths; frontend SDKs for React, Vue, Svelte, iOS, Android, and Flutter evaluate through a proxy layer. Flag hygiene is built in: flags are typed (release, experiment, operational, kill-switch, permission) with expected lifetimes, and Unleash marks overdue flags as potentially stale and surfaces unknown flags your SDKs request but that don't exist. Self-hosting via Docker keeps flag data, targeting rules, and evaluation infrastructure entirely on your side.

Used by over 3,000 organizations including Dropbox, Khan Academy, Sony, Pepsi, Wikipedia, and Mistral, GrowthBook is the open-source experimentation platform that handles over 100 billion feature flag evaluations daily across its cloud and self-hosted deployments. Feature flags support advanced targeting with user attributes, gradual percentage rollouts, prerequisite dependencies, and scheduled launches, with both client and server SDKs evaluating flags locally from a cached payload for sub-millisecond performance with zero network calls per check. The warehouse-native architecture queries experiment results directly from 11 data sources including BigQuery, Snowflake, Databricks, Redshift, ClickHouse, Mixpanel, and PostgreSQL, eliminating duplicate data pipelines. The statistics engine implements CUPED variance reduction, sequential testing, Bayesian analysis, post-stratification, multi-armed bandits, and sample ratio mismatch checks with fully open-source methodology. Product analytics provides dashboards with funnels, retention cohorts, and event-based tracking shareable across teams. Twenty-four SDKs cover React, Next.js, Node.js, Python, Go, Ruby, PHP, Java/Kotlin, Swift, C#/.NET, Rust, Elixir, Angular, and edge runtimes including Cloudflare Workers, Fastly Compute, and Lambda@Edge. The MCP server and REST API enable AI coding agents to create features, start experiments, and manage stale flags programmatically. Self-hosting deploys via Docker Compose with MongoDB, or via Helm charts on Kubernetes, with the same codebase powering both open-source and managed cloud offerings. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.

Split Pro settles the question that ruins group dinners, who owes whom, with a private expense ledger that runs on your own server instead of an ad-supported app. Create a group for the apartment, the trip, or the team lunch rotation, then log each shared cost with its category, currency, date, and a photo of the receipt. Every expense splits your way: equally, by percentage, by shares, by exact amounts, or with manual adjustments when someone covered the tip. Rent, utilities, and subscriptions can repeat on a schedule so recurring bills enter the ledger on their own. The balances view shows exactly who is ahead and who owes, and debt simplification collapses a web of small obligations into the fewest possible payments. Negative expenses record refunds and corrections without breaking the math, and the activity feed keeps a visible history of every edit and deletion. Coming from Splitwise, you can import your friends and groups to pick up where you left off, and bank transactions from supported providers convert straight into expenses. On phones it installs as a progressive web app with push notifications whenever a new expense lands. Logins use email magic links, Google, or your own OIDC provider, and signups can be closed so the instance stays limited to your circle. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.

Release a feature to five percent of users today, everyone on Friday, and only beta testers in between, all by editing one file: that is the job GO Feature Flag does for your applications. Flags live in a YAML, JSON, or TOML configuration you store in Git, S3, Kubernetes, or any retriever you already trust, and a lightweight relay proxy serves evaluations to every service through the standard OpenFeature SDKs in many languages. Targeting rules aim flags at specific users, segments, or contexts, progressive rollouts raise percentages on a schedule, experimentation splits traffic for A/B tests, and scheduled changes flip flags while the team sleeps. Every evaluation can be exported to files, S3, Google Cloud Storage, or Kafka for analysis, and webhook or Slack notifiers announce the moment a flag changes. Because the data plane is your proxy and your file, any language your stack speaks, from mobile apps to backends, evaluates the same flags with identity, variation, and rollout logic decided centrally. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.

Backed by 4,800+ GitHub stars and trusted by teams replacing LaunchDarkly and Split with a self-hosted solution, Flipt v2 delivers the first truly Git-native feature management platform that treats feature flags as code stored in your own repositories. The architecture eliminates all database dependencies by building immutable in-memory snapshots from YAML flag definitions on every Git commit, delivering sub-millisecond evaluation latency with zero external runtime dependencies beyond the single Go binary. Multi-environment support maps directly to Git abstractions — separate repositories per environment, different directories within the same repository, or different branches — enabling teams to use their existing branching strategy, pull request workflows, and code review processes for flag changes. The evaluation engine supports boolean flags, multivariate string and numeric variants, segment-based targeting with constraint rules, percentage rollouts, and namespace isolation. Native SCM integration with GitHub, GitLab, BitBucket, Azure DevOps, and Gitea creates merge proposals directly from the UI with GPG-signed commits. Flipt implements the OpenFeature Remote Evaluation Protocol with official providers for Go, Node.js, Python, Java, C#, Ruby, and Web SDKs, enabling vendor-agnostic flag evaluation across all services. The gRPC API with REST HTTP gateway exposes flag management, evaluation, and analytics endpoints. Offline mode continues serving flags when the source repository is temporarily unavailable. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. Fair Core License (server) / MIT (client SDKs).

When a family vacation or group expedition spans multiple airlines, hotels, rental cars, and currencies, Surmai brings every reservation and shared cost into one collaborative travel planner. Each trip breaks down into dedicated sections for transportation legs, lodging stays, daily activities, and travel notes. Confirmation codes, terminal numbers, departure times, and street addresses stay right where everyone in your party can find them. Built-in airport, city, and airline directories auto-complete flight routes in seconds, or you can forward booking confirmation emails directly into an active trip for automatic parsing. The chronological itinerary view then weaves flights, hotel check-ins, and excursions into a clean day-by-day timeline so your group can spot layover gaps immediately. Boarding passes, train tickets, and PDF vouchers live inside a central attachment vault. Installing the Progressive Web App caches your entire itinerary and travel documents on your phone for offline viewing at airport gates or remote trailheads. A built-in expense ledger logs shared purchases across multiple currencies so nobody has to guess who paid for dinner. Administrators can invite fellow travelers over SMTP email, enable OAuth2 or OpenID Connect login with Authentik, Keycloak, Google, or Microsoft, and replicate backups continuously to S3-compatible object storage. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.

When vacations, shared apartments, and group events turn into a tangle of receipts and awkward IOUs, I Hate Money restores harmony with a dead-simple shared budget manager that requires zero user accounts for invited participants. Organizers create a project protected by a private code and share a single link with friends, roommates, or travel companions, allowing everyone to log expenses immediately from any desktop or mobile browser. Each bill entry records who paid, when the purchase happened, what it covered, and which members benefited, supporting both equal splits and custom weighted shares for participants who stayed longer or consumed more. Built-in multi-currency conversion lets international travelers record bills in foreign currencies and convert them automatically into the project default currency. Newly added expense filtering and direct reimbursement bill creation on the Settle screen calculate the minimum number of transfers required to square every balance, while Monthly spending statistics, JSON or CSV exports, and a REST API keep group finances transparent. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. BSD-3-Clause licensed.