NLnet Foundation (grants)

What it is: European foundation funding privacy, trust, and open internet tech — grants for individuals and teams to build FOSS (not identical to a student internship, but real funding for OSS work).

Who can apply: Project leads and developers with a concrete proposal (students sometimes apply with mentor support).

Stipend / funding: Project-based grants (amount varies).

Official: nlnet.nl · NGI Zero commons fund

Tip: Pair with ESoC or GSoC if you want mentorship and later funding for the same idea.