A Tiefling's Exultation
A Planescape website with information on creatures, sects, and many other things related to Planescape.
AARG Planescape Campaign
Contains player-created spells, magical items, characters, rules, and links for the Planescape setting.
Hawkwind's Planescape Fiends
Detailed information about several of the races of Planescape along with links to other sites.
I Am The Mimir
Unofficial Planescape fan site. Contains information on Planescape including a list of new monsters and netbooks.
Jenkin's Planescape
Contains Planewalker Guidebook which includes information about outer and inner planes, sigil, factions, blood war, as well as psionics in the planes, character point tables, planar races and classes.
Keys-to-the-Cage
Journal for the Keys-to-the-Cage Planescape chronicle with background information, character profiles, journals, and house rules.
On The Wings of Mephits
A collection of original magical items, Planescape fiction, house rules, and links to other sites.
Planescape Encounter Charts
Expanded random encounter charts for most of the Inner and Outer Planes.
Planescape Fiction Archive
A collection of original Planescape fiction.
Planewalker.Com
Official Planescape website with monsters, characters, a searchable index of Planescape related websites, and the ezine The Eye.
Playing in Planescape
Some files to download, new rules, and a page of links.
Raven's Art Page
A page filled with original artwork based on the Planescape setting.
Reshaping the Multiverse
Features new rules for the effects of character's beliefs on reality and a DOS-based character generator.
Scripta Planorum
A page with information on many aspects of the Planescape campaign setting.
The Carceri Exiles
Dedicated to the famous planescape artist Tony DiTerlizzi. Contains information about the Dispossessed Sect, art, and links.
The JesterLich's Court
Original characters and descriptions of new factions.
The Kriegstanz
A conversion of the factions to 3rd edition. With faction-specific characters, prestige classes, and feats.
The Ordial Plane
A Planescape site with new NPCs, house rules, new spells, original magic items, and some new creatures.
The Outer Planes
A site with detailed information on the many planes.
The Roaming Genasi Tavern
Contains information about the various types of Genasi.
The Sensoriums
Character descriptions, archived ezines, and a related art gallery.
Unless Infinity
New rules, monsters, skills, and a page of links.
Walking The Planes
A reference guide to the Planes, both Inner, Outer, and Prime.