Thread:Talk:Summer of Code 2013/List of project ideas/reply

Writing a VisualEditor plugin (e.g., "write a plugin to let users edit sheet music visually in the VisualEditor" or "…source code…" or "…poems…" or "…timelines…" or …) are an option that (a) didn't make your list, and (b) are written in JS, not PHP. :-)