Intellinote is enterprise collaboration and project management software that is a relative latecomer to this market (Intellinote is founded in 2013). Intellinote reviews aren't many but positive, and according to Wikipedia, over 4500 companies use product. If you are looking for a free Intellinote alternative, Bitrix24 is worthy of your consideration. 100% free for up to 12 users, it comes with unlimited workspaces, projects tasks and subtasks. Bitrix24 also comes with fully featured document management, online storage and file synchronization. If you are looking for a choice between a cloud and a self-hosted collaboration platform, require open source code access, Bitrix24 is here for you.
* Please note that the information may have changed since the publication. For current prices and features please visit Bitrix24 pricing page.