Hi Friend,
No, Cisco WLC will not support any third party APs. Even if Cisco APs are not lwapp AP then WLC will not be able to manage them.
We need to have Cisco Lwapp APs only for wireless lan controller to manage them.
For 3com Aps you need to talk to 3com guys or any third party tool if available to manage these APs.
HTH
Ankur