I've been building Zentro, a desktop SQL IDE (Windows, macOS, Linux) that's organized around projects rather than loose connections. It supports PostgreSQL, MySQL, SQL Server and SQLite, and it's written in Go + Wails on the backend with React + TypeScript on the frontend, shipping as a single executable. With v0.10.0 (released 2026-10-23), the core is now open source under GPL-3.0-only : https://github.com/ZentroIDE/Zentro What "open core" means here (and what it doesn't) ...