X.Org Endless Vacation of Code (EVoC)

What it is: X.Org Foundation program funding X11/Wayland/graphics stack work with mentor pairing (similar spirit to GSoC, run by X.Org).

Who can apply: Developers with relevant C/graphics systems interest — read current EVoC criteria.

Stipend: Paid project funding when rounds are open.

Official: XorgEVoC wiki