I beg you, if you are a developer of an open source app or program - add screenshots of your app to the README file. When looking for the perfect app, I had to install dozens of them just to see what the user interface looked like and whether it suits me. This will allow users to decide if the app they choose will suit them… Please, don’t think about it, just do it…
There’s an awful lot of comments in this post from people complaining that developers aren’t making their projects attractive and user friendly enough, or the READMEs descriptive enough.
Can I just say, as a developer with some open source projects on github, I don’t care; you’re not my intended audience.