Couple foss projects deserving your attention:

- Link Manager: https://www.linkace.org/

- UX Design Tool: https://penpot.app/

- Newsletter Manager https://listmonk.app/

- Self-hosted Heruko alternative: https://coolify.io/

- Survey & Forms Builder: https://www.limesurvey.org/

- Code Editor: https://helix-editor.com/

- Self-hosted music streaming: https://ultrasonic.gitlab.io/