10 Best Open Source Projects Every Developer Should Know (Including One You've Never Heard Of)

Most developers know the big names. Docker. Postgres. VS Code. But there is an entire layer of open-source tooling that most teams still rely on paid SaaS for — secrets management, background jobs, observability, document signing, malware scanning — where the open-source alternative is already better. Here are 10 projects worth knowing in 2026. One of them, you have almost certainly never heard of. TL;DR: open-source has caught up in nearly every category. These 10 projects cover the gaps most t