Intuit QuickBase, as the name implies, is a web based database that can be used for sales (CRM or contact manager), records and document management, project management and workplace collaboration. Its biggest advantage (apps) are also its biggest drawback - constructing apps may seem challenging, especially if you are a newbie. If you are a looking for a free QuickBase alternative that is highly customizable, but comes with CRM, Project Management, Document Storage and Human Resources Management system that is already set up and ready to use, Bitrix24 is a great fit. Another great advantage Bitrix24 offers is an option between cloud and on-premise deployment. Open source code is available in the self-hosted version. Here's a quick Intuit QuickBase vs Bitrix24 comparison chart.
* Please note that the information may have changed since the publication. For current prices and features please visit Bitrix24 pricing page.