Yes, you can use these kinds of programs only if you're a Pro user. Through Tube, you can use any program which supports the Icecast2 streaming protocol. Some programs do not allow Icecast2 streaming, but you can use others that support audio capturing and streaming via Icecast2 (for example, using Nicecast on Mac allows you to use any audio program with Spreaker).
Here are some programs that are compatible with Spreaker:
Winamp + Edcast