Volunteer in Technical Writing

Hi,
I have 3 years of experience in technical writing in software and mechanical domain, I have written operation, maintenance, user guide, release notes, SRS, and installation docs.

I want to volunteer for documentation in open source domain, will work for any project and according to the need of the project.
I am new to github but with little guidance I can do the documentation.
Please reply if you are looking for volunteers in technical writing.