Well, Octro definitely will charge eventually (though I'm going to get a free license...see, there are perks to extensive beta testing
)
The developer is a real good guy who listens and works with you. In fact, it'd be nice to get more feedback.
For instance: my notifications do not work for Octro. Do they for you?
Just try it out and drop them a detailed email with your experience and any issues you have.
Also, Octro can do VOIP to Gtalk, which is cool. I'll probably make a separate post about this.