Sonic's Timeline SRB2 Message Board

First of all I'll mention I wont count spinoffs as mainline cannon games (Sonic Rush, Mobile Sonic games, Sonic Racing games) I'll count the storybooks as the gameplay has kind of a development of an early boost (although as someone who played them I must say that those boosts were crappy)

The best Sonic fan games

Goo Sonic SRB2 Workshop

Saturn Sonic by EddaheadNG on Newgrounds

Sonic Reclassified (Video Game) - TV Tropes

NES Sonic SRB2 Message Board

Sonic Robo Blast 2

Toei/Junio Sonic by Masterpiece12437 on Newgrounds

Prerelease:Sonic Robo Blast 2 - The Cutting Room Floor

Release] Sonic Robo Blast 2 for New3DS, Page 3

SRB2 History thread

Accurate Classic Sonic in Sonic Robo Blast 2

Neon's Sonic 3 Character Recreations & Origins Amy