Astoria

 Author-it

 Bluestream XDocs

 ConteX

 DITA Exchange

 DocZone

 Inmedius Horizon

 In.vision DITA Enterprise Suite

 IXIASOFT DITA CMS Framework

 PTC Arbortext Content Manager

 RSuite CMS

 SiberLogic SiberSafe

 Trisoft

 Vasont

 X-Hive Docato (now a part of EMC)

 XyEnterprise Content@