Curtis and SSM chips in synthesizers
For a long time, Wikipedia had a comprehensive arfticle on Curtis and SSM chips in synthesizers. It was very useful and I kept visiting it until it was removed... 
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CEM3310 - Voltage Controlled Envelope Generator

Crumar Trilogy, Stratus and Composer.
Moog Memorymoog
Oberheim OB-8, OB-Xa, OB-SX, OB-1
Paia Proteus
PPG Wave 2.2, 2.3
Sequential Circuits Prophet 5 rev 3, Prophet 10, Pro-One
Synton Syrinx

CEM3328 - Four Pole Low Pass VCF

Crumar Bit 01, Bit 99
Ensoniq Mirage, SDP-1
Doepfer A-122

CEM3330 - Dual Voltage Controlled Amplifier

Crumar Trilogy, Stratus, Composer
Oberheim OB-8, some OB-Xa
Paia Proteus

CEM3340 - Voltage Controlled Oscillator

Crumar Spirit
Doepfer A-109, A111-2, A-111-3, A-111-4
Oberheim OB-8, OB-Xa, OB-SX
Octave Plateau Voyetra-8
Paia Proteus
Roland SH-101, MC-202, Jupiter 6, MKS-80 early models
Sequential Circuits Prophet 5 rev 3, Prophet 10, Prophet 600, Pro-One, Prophet T-8
Simmons SDS7
Steiner Parker EVI
Synton Syrinx