Ask HN: Sources of part-time programming income?

Employment tends to be all or nothing but often a day's work to provide a basic income while working on a startup idea is what's needed. Recruiters tend not to be interested in part-timers so what kind of programming services have you found to be a good source of part-time income? I'm thinking of services offered to small/medium businesses rather than startups, ie. part-time employment not side projects.