A tool that can be used to manage time to work on a project, I think it's interesting. Sometimes someone forgets how much time they spend working on their project. But of course, why not use this tool so it will be easier for the team to know how long they are working on the project.
Btw, you mention this tool has an open source, only suggestions, it would be nice if you also paste the github repository on your body post if they have open source, so that someone can easily access the source code of the product you are share.
Happy hunting :)