If using open source projects and sharing my experience by helping others on forums and logging detailed bugs when I find them counts as contribution, then everyday.

I’m a software dev myself, but I have enough on my plate with my day job and two kids that have to be taken to all manner of activities. I don’t know how all these people find the time to work on free software, probably for little to no compensation, but my hat is off to all of you, wherever you are.