There are as many tools for project management as there are leaves in any given leafy tree. I have found that Asana is pretty reasonable for free tools, but YouTrack is another option. You may also find Phabricator useful, although when I used it last it wasn’t exactly ready for prime time. Github and Bitbucket both come with issue management tools and both are tied to VCS so its easy to keep them up to date - though not a full project management suite.
://www.jetbrains/youtrack/
https://asana/
://phabricator.org/
Having 0 funding is tough, but if you get serious about your project you wont regret moving to JIRA. Even with “0” in your pocket book, you can likely find $10 in a given month. Add confluence for another $10 and you are looking at nearly an end to end solution for tracking, managing and documenting your project.