[Ologn]

Like the PP, I can be using a FOSS application or library and notice a bug, or try to run it against some unsupported device, or against the new version of something. I fix it for myself if I can, then I send the patch upstream. It is like stone soup - the original FOSS project implements something for their needs, I tweak it a little to work for me, and soon enough you have a program useful to a lot of people.

Also sometimes I write something for myself, then think it's possible someone else might find it useful, so I release it as FOSS on say Github. Later I see people watching it, starring it and forking it, and even adding commits to their forks, so I figure someone else must have found it useful.