Why not put Free / Open Source on your resume so they can't avoid seeing it? Experience is experience. A company name, length of time, and languages / platform

Why not put Free / Open Source on your resume so they can't avoid seeing it? Experience is experience. A company name, length of time, and languages / platforms used is really all you need to say if there is nothing better to put in the space; I expect references would be helpful for most clients in that case, however.