Google Season of Docs
What it is: Program for technical writers to improve documentation for open-source projects, with project grants (when Google runs the program — check each year).
Who can apply: Technical writers and doc-focused contributors pairing with accepted open-source organizations.
Funding: Often ~$5,000–$15,000 USD per project (varies by year and project size).
Official: developers.google.com/season-of-docs