Quadra... apparently you used the wrong search criteria, because:
Vintage Synth Explorer
Excerpt:
"The Vintage Synth Explorer was established back in 1996 in order to provide a fast and easy way to learn about vintage synthesizers. This has grown to include modern digital and analog emulators, software synths, plug-ins, and other new types of synthesizers and samplers.
Here you will find detailed descriptions and reviews, pictures, audio samples, technical specifications,
famous users,
patch files, manuals, links and more - for over 650 instruments!"
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Navigate to the "timeline" tab first, and click the synths you're interested in learning about.
After you get done with that site, and want to get your hands on free VSTi emulations... just google them.