List of compression algorithms

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JCALG / JCALG1

Signature (ASCII): JC
Signature (HEX): 0x4A 0x43
List of games using this compression: JCALG category on the Wiki
Programs supporting it: jcalg1, quickbms
Open source implementations: jeremycollake/jcalg1

ZLIB

Signature (ASCII): x
Signature (HEX): 0x78
List of games using this compression: ZLIB category on the Wiki
Programs supporting it: offzip, quickbms
Open source implementations: madler/zlib