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I'm quite happy with irssi, just figured it was worth checking. Lots of stuff becomes free software if it sticks around long enough. Blender is a big one that was originally proprietary, I believe. I did check Wikipedia before posting and "get my answer", but I also considered that it could be out-of-date, or that there could be something in the works that the loyal users would know about, maybe a blog post about plans to liberate it in the future. Asking here seemed like a surefire way to double-check, but admittedly the answer was not that important or relevant to me, yeah.