Scrumfast is a free project management tool for small businesses, start-ups and personal projects. It's extremely lean, so the user interface is extremely inviting and no training is required. Tasks can be assigned users, tags, priorities, epics. Commenting and logging are seamless. A handy Github integration is available, along with history views and configurable notifications. Typical burndown and velocity charts are available. Scrumfast is a terrific option for scrum on a budget.