LibreArp is a free software (free as in freedom) pattern-based arpeggio generator (a.k.a. arpeggiator) written in C++ using the JUCE framework.
This is LibreArp's public GitLab repository. If you are looking to download the release binary versions of LibreArp to use with your favourite DAW, you can find them on the official website, where you can also find the user guide and everything else you need to get started. If you have found a bug or have an enhancement idea, you can submit it as an issue in the tracker.
If you are a developer, welcome to the repository! The wiki serves as a development guide. You can find information on how to build LibreArp there.