Jim Hall writes: "I'd like Slashdot's help in a study I'm working on, about software usability — specifically, the usability of open source software. My history in writing and contributing to Free and open source software goes back to 1993 (including FreeDOS, etc) so I know most open source developers put functionality and features first, and the user interface is "form follows function." That means a lot of open source programs can be difficult for "average" folks to use — and sometimes, even for other developers to use. My study will include a usability test, and the output will be an analysis of open source software, identifying features that make for successful usability so other open source programmers can use that for their own programs. You can find more information at my blog. My question for Slashdot is this: What open source programs have good usability? What open source programs would you recommend for this study?"