I do agree that the one is a likely a hsp warhead or redcat Shockwave. The blue one I'm not sure is, the blue anodized "radio tray" doesn't look like them and i found 15 on the engine. The body mounts on it also appear to maybe be a truck body
EDIT: I have now identified both of these:
Purple one is likely a HSP Warhead/Redcat Shockwave. They are very similar buggies and I lean to HSP Warhead due to green wheels (Although they could be aftermarket)
Blue one was a lot harder to identify but it is a Great Sprint VH-L1/Sprint VH-L1/Speed...