Collaborate with others to build your visibility, their visibility, gain access to resources, share access, increase value. Complimentarity. And I mean something pretty simple with this–who compliments what you are doing? Who has a similar market to your which will allow you both to increase your visibility to your target? What products and services compliment what you are offering? How can you leverage that compliment to build your revenues?
It matters significantly less what your competition is doing (unless you want to stay in red oceans) and does significantly matter who you have explicit and implicit cooperation with.
See Blue Oceans.