I like the symbol that looks like a close parenthesis at the end. Is it possible to add a couple more of different sizes to communicate the idea of network or connection? Think about integration software and how different modules talk to each other.
I also like on entry #27 the "hub" or "sprocket" image. My concern with this version is that it is too busy. Have you considered a version of the "sprocket" that is a little more simple?