I call myself a programmer ..

.. but I'm really not, I just write number crunching software for my own personal and immediate use.

I feel like I need to validate myself by writing a software that will be useful and used by many. Can you suggest anything?

Disclaimer: All my software is stallmanized, your freedoms will be preserved.

Efficient web browser.

Fight the "speed at the expense of everything else" thought that everyone else seems to be pushing.