Interesting open source projects, tools and libraries worth knowing about.
Gitea is the lightweight self-hosted GitHub alternative — single Go binary, 55k+ stars, GitHub Actions compatibility, runs on a Raspberry Pi. There's also Forgejo, its community fork that many now recommend instead. Here's what both are and when to pick which.
Fleet is the open source MDM that manages macOS, Windows, Linux, iOS, and Android from one platform — with GitOps workflows, osquery-powered visibility, and no vendor lock-in. Here's what makes it different from Jamf and Intune.
Flagsmith is the open source feature flag and remote config platform that decouples deployment from release. Self-host for free with no user limits, or use the managed cloud. BSD-3-Clause licensed, 15+ SDKs, and a built-in MCP Server for AI agent workflows.
Supabase is the open source Firebase alternative built on PostgreSQL — auth, real-time database, storage, edge functions, and auto-generated APIs in one platform. Self-hostable, Apache 2.0, and genuinely production-ready in 2026.
Dify is the visual LLM app platform with 138k+ stars that lets you build RAG pipelines, AI agents, and multi-model workflows in an afternoon. Self-hostable, model-agnostic, and production-ready. One honest caveat about the license.
Dokploy is the open source PaaS that gives you Heroku-style deployments on your own VPS — Git push to deploy, automatic SSL, databases, and Docker Compose support, all on infrastructure you own. Here's how it works and how it compares to Coolify and CapRover.
Invoice Ninja is the self-hostable invoicing platform that replaces FreshBooks and QuickBooks. Invoices, quotes, recurring billing, 45+ payment gateways, time tracking — your data on your server. Here's what it does and the license catch.
Outline is the fastest, most polished team wiki available — self-hostable, real-time collaborative, and Notion-inspired. There's one catch: it's not actually open source. Here's what it is, how it works, and whether that matters for your team.
Plane is the open source project management tool that replaces Jira, Linear, and Asana. Issues, cycles, modules, and roadmaps — self-hostable, with full data ownership. Here's what it does and how it compares.