I'm working with my brother on a website idea we have, and we'd like to use a tool to plan sprints and assign estimates to individual tickets.
Atlassian's JIRA+Greenhopper looks fantastic but costs $20/month and at this stage we're just validating our idea and would rather not spend money on a tool if we can avoid it.
Are there any free alternatives to these tools?
Taiga is 100% free and has all the features that comes with something like JIRA.
It even has a burn-down chart! So that's a win!
Here's a site with a nice overview of what Taiga integrates with and real developer opinions on the tool.