We are planning on opening CrowdWorks up in the future so that users would be able to search for interesting companies, but at the moment everything works only by invitation.
However, if you go to the explore page you can find open communities which you can join. For example check out the DNB NXT community, where you will find many interesting companies.
PS. Don't forget to update your investment preferences. Profiles that have activated investment preferences will get recommended interesting companies based on their preferences.