Sense/Net is described as 'ECM is the industry’s first open source SharePoint alternative for the .Net platform with a free Community edition, and a fully supported Enterprise edition. Manage you intra, extra and internet sites from one system' and is an app in the Business & Commerce category. There are more than 10 alternatives to Sense/Net for a variety of platforms, including Online / Web-based, Windows, Linux, iPhone and Mac. The best alternative is Microsoft SharePoint. It's not free, so if you're looking for a free alternative, you could try Samepage or Alfresco Community Edition. Other great apps like Sense/Net are Huddle (Paid), Nuxeo Platform (Paid, Open Source), HCL Connections (Paid) and Linchpin (Paid).
Samepage facilitates communication, project management, meetings, online collaboration and more by combining chat, video calling, screen sharing, task management, file sharing, and real-time document collaboration in a single collaborative workspace.
Huddle is online collaboration & content management for the enterprise. It gives you a network of secure online workspaces where you can store & share files, collaborate on documents, manage tasks & create discussions.
DWKit is a .NET open source BPM system made with simplicity and flexibility in mind. DWKit allows you to model, automate and execute mission-critical business processes, whatever industry you’re operating in.