The best replacement for xenapp 6.5 is xendesktop 7.

The best alternatives to xenapp 6.5 are rated as following:
★★★★★  xendesktop 7
★★★  rds 2012
★★  presentation server 4.5

Your alternative for xenapp 6.5 is not listed? Suggest!
Speaking about xenapp 6.5, one probably shouldn't forget about secure gateway.

Other search terms related to xenapp 6.5 and their ratings are:
★★★★★ secure gateway
You have in mind a companion for xenapp 6.5 and it is not yet here? Propose!



Google Trends

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xenapp 6.5
xendesktop 7
rds 2012