Wikipedia: Lilo & Stitch franchise
When I first started this site in 2006, I could find hundreds of fansites on Lilo & Stitch (thus the name), but none quite to my satisfaction (thus why I started it.) Now, there only seems to be a few left (and a lot of them abandoned.) :(
A Lilo & Stitch Fansite
A somewhat hecticly-arranged site collaborated by several authors and started by kinzu_kiwi.
Save Lilo & Stitch
A site aiming to get Lilo & Stich back on the airwaves. While I can't help but feel at this point it's a lost cause, they do have some interesting information, a shoutout board, some fanworks, and a list of experiments. And I can't fault their determination!
Lilo & Stitch Database
A wiki for Lilo & Stitch.
"Lilo & Stitch" and The Films of Hawaii
An interesting site with background information on both the fim and the location it was set in.
Nancy's Lilo & Stitch Ohana Obsession
A collection of images, information and lyrics for Lilo & Stitch.
Kamehameha Elementary School's Lilo & Stitch page
A fanpage by the students of Kamehameha Elementary, whose choir sung in "He Mele No Lilo".
Fanblogs and image collections
The Ohana of Lilo & Stitch Lovers | FY! Lilo & Stitch | Just Another Lilo & Stitch Appreciation Blog | blue punch buggy | Earth Expert
A bunch of Tumblr blogs that post screencaps, GIFs and thoughts on Lilo & Stitch.
THE GOVERNMENT WANTS TO KEEP US QUIET
An older website also made by kinzu_kiwi. Mainly just screenshots and GIFs.
Tiki Stitch Blog
A blog about Stitch merchendise.
Save Our Stitch (Yahoo! Groups)
The Yahoo! group for Save Lilo & Stitch.
Disney's Lilo & Stitch Forum (Yahoo! Groups)
One of the most popular boards in its' heyday. Now only semi-active.
The People Involved
Chris Sanders: Official website | Kiskaloo (a webcomic) | 'alohalilo on deviantART | Facebook | Twitter | Wikipedia
Chris Sanders is the creater and co-director of Lilo & Stitch, also voicing the character Stitch in most of the English media he has appeared in.
Jess Winfield: Official website | Infinite Jess (blog) | L.A. Food Crazy (another blog) | Facebook | Twitter | Wikipedia
Jess Winfield is the executive producer and a writer for Stitch! The Movie, Lilo & Stitch: The Series and Leroy & Stitch. He's also the producer for the English localisation of Stitch!, and voices Jumba Jookiba in it.