I have an idea on my mind to develop and sell small helpful developer tools like the tool asked in this question http://stackoverflow.com/questions/2562378/visual-objects-editor.

I am looking for your answers which will shortly describe "How" and "What" to sell in order to be successful at that.

I imagine different answers here from concrete to more general.

Examples:

1. "Sell your visual objects editor and I will buy it :-)"
2. "Tbe only way to sell developer tool is to integrate it with known Java IDE"
3. "Developers won't pay for the tools they use. Make it free and be famous"

I encourage others to vote for the answers they like the most.