A Station Eight Fan Web Site
A document written by Greg and posted on the Internet before Ask Greg even existed. It describes Greg's proposed spin-offs and their (very) general plot lines. It can be found here. Note that some of these spin-offs have been tweaked or outright refurbished since this was written, most notably "Future Tense" (which became "Gargoyles 2158," then "Gargoyles 2198").
Well, doing more Gargoyles actually happened: GOLIATH CHRONICLES. So that would be #1. Second would have to be BAD GUYS, which we developed extensively and did an animatic reel. Third would probably be DARK AGES, which we did a short art pitch on and actually pitched to CBS. Fourth, would probably be a tie between NEW OLYMPIANS, which we did another art pitch on (for internal purposes) and PENDRAGON, which I pitched verbally and internally and sparked some brief interest. Sixth would be FUTURE TENSE, which CBS expressed a brief interest in. Seventh would be TIMEDANCER, which I basically came up with too late in the game. It was never seriously considered.
Both of these were earlier versions of what is now known as "Gargoyles 2198."
GargWiki.net has answers for all your Gargoyles questions.
Includes episode commentaries by co-creator Greg Weisman, interviews with the cast, and a documentary on the fan convention.