What is the best CMS (Content Management System) for a B2B portal?
I would like to start small B2B portal for buyers and sellers. Can you please recommend me free CMS like WordPress, Joomla and etc. Features include:
User signup via Facebook or Google account
Buyer and seller account
User account management
Free and paid membership
If you're looking at a custom dev, you could try SE. It can be modified to suit your requirements. As you're a developer yourself, there are several open source modules that can be adapted and integrated into that platform.
However, if you're looking for a barebones framework, Makoala is also a good one to work with. I believe it's open source as well.
Hope this helps, and feel free to connect if I can of further help.
You could also try one of the cheap clones of sites like alibaba (or other of your favorite b2b portal). the clones don't use the best security, and they aren't the prettiest in the world, but for just starting out at low cost this might work for you. just google "alibaba clone", etc.