OpenCT supports Aladdin eToken PRO tokens fine. They have been tested with OpenSC under Linux and work perfectly.
Note however that on application layer the Aladdin software is using a different storage format than OpenSC. See the OpenSC wiki for details.

Aladdin sponsored an OpenSC/OpenCT talk/workshop at the Chaos Communication Congress with some tokens. Thanks a lot!

The cardos-info tool of OpenSC will show you additional details about your Aladdin eToken PRO.

OpenCT 0.6.4 and OpenSC 0.9.6 work perfectly. Tested on Linux (Debian sarge, May 2005, Kernel 2.6.11.*).

Aladdin eToken 64 support is new and will show up in the next openct release. It has not yet been tested.

http://www.ealaddin.com/etoken/pro/usb.asp Aladdin Knowledge Systems / product page for eToken PRO.