Spyps is a "visual" process tracing utility. Conceptually, it is similar to strace, as it displays system calls invoked by processes. It also offers several other features, such as the ability to slow down or pause the execution of traced processes.
The program is still in early development stage. Current version (0.0.1) runs on Linux only and recognizes merely a few system calls.
03-05-2005 - spyps 0.0.1 released.