Sibbell is described as 'Stay on top of open-source with personal notifications for repos you star or watch on GitHub'. There are more than 10 alternatives to Sibbell, not only websites but also apps for a variety of platforms, including Self-Hosted solutions, SaaS, Linux and Raspberry Pi. The best alternative is Libraries.io, which is both free and Open Source. Other great sites and apps similar to Sibbell are NewReleases (Free), Banditore (Free, Open Source), ReleaseBell (Free, Open Source) and Diun (Free, Open Source).
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