Go to a forum, or StackOverFlow, and see what people want that you could make a tool out of.
On a more serious note, I have a few workflow problems which will definitely make me shell out few bucks if there is a polished product.
In fact, i have more than a few. I'll give you one example. There should be a really nice cross-platform diff viewer for people who use git from the command line. My reasoning for that is that i like using the command line for git because it is way faster than GUI, but i always end up using the terminal for viewing diffs and stashes.
On a more serious note; just in case.
- A tool that combines logic of my source control (commit history), static code analysis, and my ticketing system to produce a risk matrix for my code components so I can better estimate how risky a feature or bug fix is to implement. I.e. Many commits in a short amount of time, with multiple issues reported in that code area and bad static analysis results probably means I need to rewrite that part entirely and hence have to double estimations.
- jetbrains resharper for Web languages.
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