Some images were obtained from "free icons web", with no license information provided other than "free": http://freeiconsweb.com/gif_icons.htm (Link is dead, can't find a replacement, sorry)
Some images are part of various free icon packages from Aha-Soft, CC-BY 3.0 US. https://www.aha-soft.com/ / https://www.small-icons.com
Some images are from the FatCow free icon set, CC-BY 3.0 US. https://www.fatcow.com/free-icons
Crash.Audio.SampleLine::ToPCM and Crash.Audio.ADPCMConv are based
directly off of some code from nextvolume's psxsdk (vag2wav.c), which claims
it's "Based on VAG-Depack 0.1 by bITmASTER".
This program is sometimes packaged with OpenTK, in which case the license for OpenTK will be included in a separate file.
Aside from that, whatever.