Poseidon - it works on different platforms (Java code), but on the other hand uses lots of memory.
By means of Poseidon we have created class and use-case diagrams. Unfortunately, the program has not been able
to save our sequence diagrams, so we had to find another tool.
http://gentleware.com/
Enterprise Architect - a very fast tool that works with windows and linux Wine emulator. By means of EA we have created sequence
diagrams.
