I've implemented the Elder Auto Envelope and Chandelier Exit (Long + Short) indicators on Prorealtime - couldn't find an implementation anywhere else. Both feature in his book 'Come into my trading room'. The code can be found here:
Auto Envelope: http://alexpotrykus.com/blog/2013/11/15/prorealtime-elder-auto-envelope/
Chandelier Exit: http://alexpotrykus.com/blog/2013/12/08/prorealtime-chandelier-exit/
Auto Envelope: http://alexpotrykus.com/blog/2013/11/15/prorealtime-elder-auto-envelope/
Chandelier Exit: http://alexpotrykus.com/blog/2013/12/08/prorealtime-chandelier-exit/