SQLPage
If you can write a SELECT statement, you can publish a working web app with SQLPage, where each query's results appear on the page as tables, charts, maps, or forms. A .sql file is a page. Name a component in the first row, and the rows after it become lists, cards, data grids, timelines, or step trackers. Tables offer searching, sorting, frozen headers, and per-row edit and delete buttons. Charts cover line, area, bar, pie, scatter, bubble, and heatmap views with a one-click CSV export. Forms feed INSERT and UPDATE statements directly, with validation and file uploads. A complete CRUD tool takes a handful of queries. The map component plots markers and GeoJSON shapes, and the JSON component lets the same data serve other systems as an API. Protect private pages with password logins or single sign-on through Google, Microsoft, or your own identity provider. Connect to SQLite, PostgreSQL, MySQL, SQL Server, or ODBC sources such as DuckDB, Oracle, Snowflake, and BigQuery. Tabs, modals, alerts, breadcrumbs, and carousels shape multi-page sites, and custom templates, CSS, and JavaScript fill any gap. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.
Corteza
Salesforce's platform model, 100% open-source (Apache 2.0): Corteza is a Go/Vue.js low-code platform developed under a foundation, so there is no open-core bait to grow out of. The heart is Corteza Compose: namespaces contain applications, modules define record structures the way Salesforce objects do, and a drag-and-drop page builder assembles record pages, list pages, dashboards, and charts from configurable blocks. Automation comes from a visual, BPMN-style workflow engine plus JavaScript automation scripts, so cross-application business logic - approval chains, field updates, notifications - is configured rather than programmed. Granular role-based permissions reach down to individual modules, fields, and records, mirroring real organizational hierarchies. Corteza CRM ships as the flagship application built entirely on Compose: leads, accounts, opportunities, campaigns, and cases with a 360-degree customer view, covering most Salesforce standard objects - and because it is just a Compose app, adding or reshaping modules is configuration, not a fork. Everything is reachable over REST APIs, deliberately familiar tooling eases Salesforce admin migration, and a CLI can even generate synthetic records for load-testing what you build.
REI3
Replace the spreadsheet that quietly runs your department with a proper multi-user application that you design in a browser with REI3, a self-hosted low-code platform. Authors define their data model once, then assemble forms, lists, calendars, Gantt plans, Kanban boards, and charts around it, with form states that show, hide, or require inputs as a record moves through its workflow. Calendars create records from a drag-selected time range, Kanban cards change state by drag and drop, and bulk-update forms edit hundreds of records at once. Phones scan barcodes and QR codes through the camera, and signature pads capture drawings. Roles and record-level access policies decide who sees what, sign-in runs through LDAP, OpenID Connect, or multi-factor authentication, and end-to-end encryption keeps selected fields unreadable even to administrators. REST endpoints work in both directions, ICS feeds publish calendars, CSV moves data in bulk, and IMAP and SMTP accounts connect applications to email. A drag-and-drop PDF editor produces letterheads, labels, and documents with signatures and barcodes. More than a dozen free ready-made applications, including tickets, time tracking, IT assets, a password safe, and a CRM, install from the admin panel. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.