I am collaborating with a few guys on a small project. To keep everything in one place, I suggested using Shatb. With its help, we track tasks and progress. So far, the free features are enough for us. The team limit is 5 people (there are three of us, so we fit within that). The only unavailable features are card templates, privacy and access settings, Gantt charts, custom fields in cards, integrations, etc. This is not critical for us. The service is cloud-based, providing 1 GB for free for everyone, which is sufficient for now. But if the need arises, we will switch to the paid version, as the price is quite reasonable.