TeamGantt is a simple, elegant and fairly inexpensive cloud project management solution. It's perfect for small team, but it's not without disadvantages. First, there's a free plan (one project for three users only) and paid plans limit you as to how many users/projects you can have. Second, there are no team collaboration tools of any kind (videoconferencing, group chat, activity stream) - just comments. You can attach files to tasks, but there are no document management or file sharing tools available. Neither time tracking nor billing are currently present inside TeamGantt. Third, lack of native Android and iOS apps for TeamGantt is a huge omission as well. Finally, there's no self-hosted option that you can customize and integrate with other tools that you might be using. If you are looking for a free TeamGantt alternative that doesn't have these limitations, Bitrix24 makes a good choice.
* Please note that the information may have changed since the publication. For current prices and features please visit Bitrix24 pricing page.