Before I started to work on Tolgee I was used to working with Jira. But I didn't like it much, so I chose YouTrack for project monitoring that time. Now it seems better to move the project management to GitHub, since it's more transparent for developers. Also, there is a kanban board feature on GitHub, so we can move the issues as we were used to in YouTrack, but it's also visible to everyone.
Here are the important links.