The best Issue Tracking alternative to SourceForge is GitHub, which is free. If that doesn't suit you, our users have ranked more than 50 alternatives to SourceForge and 16 are Issue Tracking Systems so hopefully you can find a suitable replacement. Other interesting Issue Tracking System alternatives to SourceForge are Codeberg, Gitea, Forgejo and Bitbucket.
SourceForge alternatives are mainly Issue Tracking Systems, but if you're looking for
Source Code Hosting Services or Version Control Systems you can filter on that. You can also filter by region, for example
EU-based alternatives if you prefer software developed in the European Union. These are just examples - use the filter bar below to find more specific alternatives to SourceForge.