In elite section:

1. look at this post http://www.forex-tsd.com/81010-post22.html with many our forum links to ema crossing EAs.

2. good thread where I and Codersguru coded many versions according to request is here.

3. EagleEA:
original development thread is here with original rules, EA, settings explanation, exit settings/mode explanation and settings, some testing results and ideas.

4. one post in files thread in elite section with all those links I am posting now.

But there are very good threads/EAs in public as well:

1. EmaFibo EAs. The settings was optimized and posted as pre-set files together with backtesting results here. Besides please read whole Fibonacci_Ema thread for more backtesting results and versions of this EA.
- Idea development thread is here.
- some other versions - read here.

2. Codersguru developed some EMA crossing EAs http://www.forex-tsd.com/ema-cross/

3. Universal EMA cross here Universal MA Cross EA