I'm trying to develop a ESB connector for Documentum REST API. According to the information they have provided in their website, both the Documentum Content Server and the Documentum Core REST are required to user the API.
I want to know whether the content server and the Documentum Core REST are free to download and use.
Thank you in advance.
No, nothing of EMC Documentum software is free to download or use. You need to signup for some kind of partner programs with EMC (not my area, though).
However, since year or so EMC opened their community and forums publicly so you can find helpful details just googling.