Rapid T. Rabbit and Friends (Videos, Richard Concepcion, 1983-2017)
The New York furry public access TV show. You can watch a bunch of episodes of it here.
The 5000 Fans of Dr. T (Zines, 1981-1982)
You can read this anime zine here.
The cover artist of issues 0 and 10, furry fandom founding member Mark "Sy" Merlino, passed away recently.
If you're wondering what Osamu Tezuka would have thought of furries, the answer is: possibly whatever he thought of himself.
The Little Foxtaur Page (Website, ~1998)
Foxtaurs: a latter-day mythical race. You can visit this site on the Wayback Machine here.
(Tip - some image links in the galleries still work, including some broken image-links on page 4.)
Sam Siam: FurryMuck Land (Zine, 1993)
A zine about a text-based furry MMO that continues to this day. You can read it here.
Vintage Furry Fandom Videos (Videos, various years)
You can watch them here. The image below if from the last video in the playlist.
(Most of) The Games of Foxchange Software (Classic Mac, Matthew Beedle & Laurie Murphy, 1997-2003)
Includes most of Matthew Beedle's furry arcade-oriented Boulder Dash style games. Play them in your browser here.
Note: The previously linked item is no longer available - the games can be found here and run in your browser via Infinite Mac.