OpenKM is an Open Source, Web-based DMS (Document Management System) that can be used as an alternative for commercial DMS solutions such as Sharepoint, Hummingbird and Documentum etc. It works well on multiple operating systems such as GNU Linux, WIndows, Mac OS X and Solaris.
OpenKM is available in three editions such as Community(Free), Cloud and Professional. You can find the detailed comparison of three versions here.
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