Synth Zone - A directory that covers synthesizers and midi controllers, plus relevant music software and support products.

The Analogue Synthesizer Resource/FAQ - FAQ/link list for Analogue Heaven mailing list. Useful links and information.

Dancetech - Dedicated to making Dance music in home studios. Samples, synth usage tips and tricks.

Harmony Central: Synth Resources - Product news, reviews, original articles, free classifieds, software, local event locator, and links.

Jörg Schmitz Analog Synthesizers - German engineer offers schematics and turorials for a variety of analog synthesizers, with pictures of do-it-yourself models he has assembled, and links on microcontrollers and audio music technology.

Music Machines - Offers information on music technology.

Online Manual Archive (OMA) - Collection of links to online manuals, schematics, and do-it-yourself repair information for musicians.

Synth and Midi Museum - Database with photographs of electronic musical instruments.

Synth Fool - Photo gallery of analog synths, including some schematics.

Synth Site - User reviews of lots of synthesizers.

The Synthesizer Picture Archive - Photographs of new and vintage synth gear

Synthesizers.com - Arrick Robotics makes large synthesizer systems with analog circuitry including oscillators, filters and sequencer modules with wood, portable, and rack mounting options. FAQ, technical specifications.