I know there sites like rent a coder and stuff where people bid/lowball programming services based on the often poorly defined requirements of a post there. If you have a huge collegtion of various programs you can quickly adapt to the given requriement there, you can make some fast money.

Word of mouth goes a long way as well. Ping previous contacts to see if they have any one off conversions or processes they want to streamline...

Depending on your skillset you could offer selling web site updates or email campaigns