What are some alternatives?
BugHerd - BugHerd: The Visual Feedback Tool for Websites
Redmine - Flexible project management web application
DoneDone - From planning, to coding, to testing, to customer support, DoneDone is the straightforward, no-nonsense issue tracker. Start a free 30-day trial today!
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.
Pivotal Tracker - Pivotal Tracker: The awesome, lightweight, agile project management tool for software teams. Get your 30-day Free Trial started today!
Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.