Models & Customizing - General/Other - Fanart & CGI/3-D - Anime
Models & Customizing
Age of War is Maethius’ custom Zoids site. Lots of great builds here, with their own version of Planet Zi and story to go with them.- Channel Zi
Like a phoenix from the ashes, but with more Thunderball…it’s back. Again! Channel Zi was one of the sites for a lot of the fandom that rose up from the anime hitting the states, and it’s great to see it return. - Deathy's Empire of Nyx
Guess who it’s owned by! Kidding, kidding. Deathy’s got reviews of Zoids for your Zoid review-reading pleasure. 
Gojulas’ Lair is back online, now sans frames :D. Model photography, customization, and some fixes for Zoid issues.- Ironwing's War Room
Ironwing’s War Room is now back online, with the older content also available. Lots of info on Zoids releases in a searchable format. - Mister Hook's Zoids and Robostrux Site
One of the best resources for photos of obscure things like…well, Robostrux. - OcellatedStingray's Zoids Site
Lots of reviews and collection pics, organized by type of critter. - Pimp My Zoids
A customizing blog with construction posts, not just finished Zoids. Be sure to check out Wu! 
Natsumi’s site. Zoids and other things modeling (and art), including customs and painting tutorials.- Shadow Blade Zoids
Risky’s Zoids site with customized models, occasional regular models, and fanart. 
Hidocker’s site is mostly unusual and/or interesting photos of Zoids with amusing commentary…and very nice WordPress usage, unlike mine :p. The world needs more of this.- The Deal's Wheels Web Site
Darth Tres’ site, with nice photos of customs and stock Zoids alike (mostly older releases). 
GhostLiger’s collection site, with reviews and such fun things.- Ultrasaurus Red
Lionel’s chronicle of all things limited and obscure, especially the fabled Ultrasaurus Red. And customs. Cool customs. - Z's Zoids Site
Collection pictures arranged multiple ways—and with a definite focus on the motorized Zoids. 
Zoid.US has lots of content, including construction-oriented reviews of many Zoids kits and info on prototypes and other obscure things. See also: BattleRex.com, Wikd’s Zoids blog.
Zoidology is the new home of Zee Wakusei’s customs. His work is mentioned a lot in the English-speaking Zoids fandom, and for good reason.- Zoids – The Pre-Hysterical Monster Machines
Mike’s site. He’s got some nice photos of his collection, including lots of OER. - Zoids Fusion Lab
Solloby’s blog o’ reviews, with a bit of a focus on Blox and their combinations. - Zoidsism
Custom Zoids by Nobody-Here with some very nice color schemes.
General/Other
Momonga has battle story translations and other things Zoids.- Sieg.nu
Zoids doujinshi and card game scans—lots of card game scans, from multiple variations of the card game. 
Info on all things Zoids, plus a lot of translations—especially newer things, but also including the entire Ex sequel to the Choatic Century comic.
Zoids Evolution is back, complete with properly hosted forums and general Zoids content. It’s pretty slow these days, but still around!
Zoids Lair is a general site with some focus on the games (and the sprites in them).- Zoidstar
High-res scans of the entire UK Zoids comic (sadly in a Flash viewer now, contact me for other options). If you haven’t read it yet, you should!
Fanart & CGI/3-D
- Andy Whiteley.com
3-D modeling and animation, including a very sleek Gore (in Iron Kong Yeti colors). 
Cap’n Dade’s Place has custom Zoids and CGI, plus other things modeling and mecha!
Jam’s Art Blog contains Zoids, Hetalia, and original art.
Qzei is Momo’s art site…with a lot of Zoids, among other fanart and original things. Contains high amounts of battle story :3.
Anime
Blue Sky, Jammer’s O’Connell shrine/general site in one. Also has forums.
Liger’s Union, another anime fansite that’s stood the test of time. HaTcH has lots of amvs and screenshots, all at high-quality because of his DVD-ripping powers. Now with an interactive fanart gallery in php.
Masters of Zi has general anime info—plot summary, character profiles, and such. Also has a database of Zoids Legacy stats!
Zoids Tribute is one of the only classic sites left with anime info (including dub/Japanese comparisons from a Japanese perspective). The Japanese version has different content and is worth a visit too.