When designing something, or making suggestions for changes, it is often helpful to compare the test object against something similar that has already been done. To that end, I'd like this thread to be a place where playtesters can post an ACG class and another class (3rd party publisher, homebrew, or other) that fills a similar niche. Hopefully, the designers and other playtesters can use this information to see what has been done in the past, what works, what doesn't, and what might work better.
To start things off (an incomplete list):
Warpriest: Divine Channeler (Rite Publishing)
Please feel free to add more and to comment as to which classes should be used as examples both good and bad, what should be borrowed, and what should be avoided.