If you're familiar with Git (the revision-control system), the following are software - which have been initiated by others - which I have contributed code to:

1. Gitea (click here for details of my contributions)
2. Gogs (my contributions are there)
3. Tatoeba (and my contributions)

Online, my Git-related accounts are the following:

- Github, at the user-name phtan
- Gitlab, at the same user-name