USCiLab/cereal

Bitcoin Core is the reference implementation of the Bitcoin protocol, hosted at bitcoin/bitcoin on GitHub. Per its README, it joins the Bitcoin peer-to-peer network to independently validate blocks and transactions, ships an optional wallet and GUI, and is written in C++ under the MIT license.

OBS Studio (obsproject/obs-studio) is a free video capture and streaming tool released under GPL-2.0. Its topics list points to game capture, screen capture, DirectShow device input, and streaming built around Twitch, YouTube Live, and Facebook Live, and the project funds itself through Patreon, OpenCollective, and PayPal.

Public APIs is a community-curated GitHub repository listing free, publicly accessible APIs across a wide range of categories, with auth type, HTTPS, and CORS noted for each entry. It's a browsable reference, not a library to install.

Awesome Python is a curated list maintained at vinta/awesome-python that groups Python frameworks, libraries, tools, and other resources into 14 categories, from AI & ML to Security and Other. The README calls it an opinionated guide rather than an exhaustive one, and points readers to a companion site, awesome-python.com, for searching and filtering entries instead of scrolling the raw file.