Bibus Bibliographic software

Dear Bibus users.

I am in the proces of moving away from commercial reference managers like Endnote and RefMan. My eyes have fallen on Bibus. I have downloaded it but something feels wrong to me....I am beginning to suspect that Bibus is not what I think it is:
What I need is a program to add references to build up and maintain a new database.
Adding new entries from RIS/txt/ENW/ etc. files does not seem to work.... or that is Bibus does not add the reference to an evergrowing list of entries.
Before I try anything and get more frustrated I would like to ask if Bibus is only a program to maintain an already existing reference database?

Thanks in advance.

Best regards

Peter