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Antenna (feed aggregator)
CAPCOM Geminispace aggregator (public aggregator of subscribable Gemini pages and Gemini Atom feeds)
Cosmos
Gemhoo! (Heirarchial directory of capsules)
mieum (gopher, gemini, web aggregator)
Spacewalk (gemlog aggregator)
Tinylog (gemlog aggregator)
There are 111 entries in the Gemhoo! database