Update 4th November 2012: Added and edited some.
But what about the alternatives? Well, I did some research and here are the ones I found. Many of them support more protocols than RDP, like VNC, Citrix, SSH etc. Pricing is usually including 1 year maintenance and the company license is for one site.
||Last version/date *)
|ASG-Remote Desktop||$113||$2497||Also need maintenance, add $16 / $350. Only for 1 country. Cheaper to buy company license when more than 26 admins. All prices here.||2012 Patch 6
4 Jan 2012
|CoRD||–||–||Only for MAC OS X. Maybe you’re not happy with the Microsoft Remote Desktop Client for MAC?||0.5.7
25 Jul 2012
|MuRD||$35||–||Doesn’t seem to be developed anymore so there migh be better alternatives.||22.214.171.124
2 Dec 2008
27 May 2010
17 May 2012
|Remote Desktop Manager||$70||$1100||126.96.36.199
18 Sep 2012
20 Sep 2012
7 Mar 2012
*) Last version is the version available when this post last was edited. If date not found at the actual download page, I also tried to investigate when it was released either by checking release noted, in their forum or dates of files downloaded. Please comment if incorrect.
– visionapp was renamed to ASG-Remote Desktop
– mRemote was removed since it has merged with Royal TS.
What is your favorite?