My Favourite Synth Information Resources
Vintage Synth Explorer
Synth database with limited information, but many products and extensive user comments
Sequencer
Moogulator´s blog
Synthesizer AT
Robert Wittek´s blog
Gearspace
Huge gear forum
KFuenf
Great info resource about the Kawai K5
Amazona
German gear site
Sonicstate
Sonicstate´s Youtube channel with Nick Batt´s synth reviews.
Snoize
Home of the free SysEx Librarian and MIDI Monitor, small but very effective MIDI software tools.
MIDI Designer
Home of the MIDI Designer iOS app for creation of MIDI controllers
Reverb
One of the best places to shop used synths.
Rapidtables
Highly useful tool to convert between decimal, hexadecimal or binary while programming MIDI sysex.