I created an open source image gallery (floating image) in my spare time. Some company (Archos) wanted to embed it into their products, but wanted me to add support for 3rd party hosts (I had Flickr, they wanted Google, photo bucket and others). I earned about €3000 on the work and my project got better for it. Not completely unheard of, but probably the most unusual way I have made extra money.
I created an open source image gallery (floating image) in my spare time. Some company (Archos) wanted to embed it into their products, but wanted me to add support for 3rd party hosts (I had Flickr, they wanted Google, photo bucket and others). I earned about €3000 on the work and my project got better for it. Not completely unheard of, but probably the most unusual way I have made extra money.