Synthesizers, Guitar sounds, Strings and Drum machines

 Here are some drum machines online..that are free.

https://drumbit.app/ Drum it app

https://www.virtualdrumming.com/drums/virtual-drum-machine-online/drum-machine-online-free.html virtual drum machine

https://www.musicca.com/drum-machine?data=90-n-44-a--5acegikmo6em7ai-

https://wambox.net/ wambox

Synthesizers

https://www.websynths.com/microtonal/ websynth

https://nicroto.github.io/viktor/ viktor synthesizer

https://midi.city/ midi city synthesizer

https://synth.playtronica.com/ online synthesizers playground list

Keyboard Synthesizer

https://sodaphonic.com/instruments/synth Sodaphonic

https://chosenmasters.com/online-synth Chosenmasters synth

https://www.gsn-lib.org/apps/cardboardsynth/index.html cardboard synth

https://onlinesequencer.net/ online sequencer

https://michaelblawrence.github.io/CitySynthDemo/ Citysynth Webaudio

https://www.mod-synth.io/ mod synth

https://soundation.com/virtual-instruments/fm-synth fm synth

https://www.melomaker.com/ melo maker

Synth drum sounds 

https://pixabay.com/sound-effects/search/drum-synth/ sound effects 

https://samplefocus.com/categories/synth-drums synth drum sounds and samples

https://freewavesamples.com/instrument/synth-drum free waves samples 

https://www.bfddrums.com/bfd-player/ bfd drums

Some guitar sounds

https://samplefocus.com/categories/guitar

https://mixkit.co/free-sound-effects/guitar/

https://uppbeat.io/sfx/tag/guitar

https://slooply.com/samples/instrument/guitar

https://samplefocus.com/categories/electric-guitar

Some strings sounds

https://samplefocus.com/tag/strings

https://www.samplephonics.com/products/free/strings

https://www.zapsplat.com/sound-effect-category/strings/

https://www.fiftysounds.com/royalty-free-music/strings-sound-effects.html