End-to-end encrypted private information sync for Evolution using the EteSync open-source protocol.
Evolution extension which keeps Evolution running in the background for notifications to be delivered on time
Small library containing various image processing algorithms (+ Python 3 bindings) that has almost no dependencies - https://openpaper.work/en/projects/
GNOME Shell integration for Chrome
Poppler is a PDF rendering library based on the xpdf-3.0 code base.
Modern OpenGL/text-rendering example apps