Working off my "Swiss army knife" metaphor, something evoking that.
- mediaswak
- mediablade
- sonicscrewdriver (say, "ssdr" for short)
- mediamultitool (mmt)
- webMediaFlexiTool (wmft)
For me the first thing that comes to mind for "multimedia Swiss army knife" is ffmpeg. I think that right keywords here are "web", "media" and "download" (although it can do things other than downloading, like extracting stream URLs or just querying available formats).
StreamingSlayer
freedomdownloader
Or MultimediaArchiver, AFAIK it works with some audio only sources as well.