On the database website, I didn’t see any alternatives to GitHub, or even a category for that I could submit to.

“Software development, collaboration & hosting”?

Here are some:

• Codeberg (Germany, non-profit)
• Sourcehut (Netherlands)
• Launchpad (UK, it’s not just for Ubuntu stuff)
• Radicle (Switzerland, peer-to-peer: no central host)
• Free Software Foundation Europe, Gitea instance (non-profit)

Alternative to… lots of stuff: GitHub, Google, Gmail, Google Docs, Discord, Skype, Reddit, Twitter etc

• Disroot (Netherlands, non-profit)

Alternative to Microsoft VS Studio Marketplace (extensions for VS Studio IDE)

• Open VSX (Belgium, non-profit)

Open source alternative to Microsoft VS Studio IDE, with Microsoft telemetry removed

• VS Codium