I know slightly close questions have been asked before but this question is a bit different.
We are a start-up company with a very limited budget and we are looking for a completely free Agile software development process tool without any limitation on the number of users. We don't want to have a limitation for the number of users because there could be a lot of people who would do small tasks for us and if they pass the number of user limit all of a sudden we'll have to pay a lot of money for the tool monthly.
It would be very useful if it could support:
- Kanban board
- Task hierarchy (so that you can define cards within cards)
- Hosting the tool online (not download)
- Commenting system
- Different roles
- Swimlanes
I have checked a lot of those tools here:
http://agilescout.com/best-agile-scrum-tools/
but I didn't find any that is absolutely free for unlimited users. Some of them also don't have a Kanban board. I checked Agilefant but its online version is going to be paid from 2014. I also checked Stackoverflow for this but none of the questions were targeting "completely free tools".
Your help will be greatly appreciated.