It's not quite a simple solution, but Redmine has always been my go to for keeping up on personal projects. There is the fact that it requires you to setup a server somewhere to reside, but it comes with so many plugins and third party applications that make it fully configurable to meet the most complex needs.

https://www.redmine.org/

https://www.redmine.org/plugins

http://www.redmine.org/projects/redmine/wiki/thirdpartytools

Hey we’re building a tool that we think might solve your problem. I’d love to get connect with you. Let me know at adi@productinsights.co

Confluence is pretty popular, especially if you are already using Jira.