Now this is a thread I can get into! I see a lot of really nice pieces of equipment listed here.
So - Past equipment:
Roland Juno 60
Roland Juno 106? I think
Roland D-10
Any one remember the old Radio Shack branded mini-moog type synth? That was cool, it had the crappy polyphony generator layered over the "real" synth stuff.
I wish I still had the D-10 and the Radio Shack.
Current Hardware:
Volca FM - Basically a Yamaha DX7 in a small box, but only 3 voice polyphony. You can load old DX7 patches into it. So far I have not found an old DX7 patch that does not work. It may not sound exactly the same as the old DX7, but pretty close I guess.
Yamaha Reface DX - Basically a mini DX7, but with only 4 operators instead of 6. Sounds good, there are a ton of patches available online using Yamaha's Soundmondo app. It is also a great portable MIDI controller. 37 key mini keyboard but build quality is very good.
there are a couple of very good third party patch editors available for the Volca and Reface on iOS that make editing MUCH easier than on the units themselves.
IK Multimedia UNO synth. This thing is an awesome analog synth. Basically an old school type subtractive synth. There is a free editor available from IK multimedia also. If you are thinking of getting into the hardware synth stuff, this might be a good entry point.
Keystation 88 MIDI controller
iRiG Keys I/O 49 key controller with a balanced audio input and preamp.
Software synths for iPad.
Basically everything from Arturia: iMini, iSEM, iProphet, I just got iSpark, this seems like a really nice drum machine/sequencer.
Some synths from YONAC: Magellan and Kaspar.
Sample Tank, iGrand Piano, and iLectric Piano, all from IK Multimedia.
One synth I cannot recommend enough. Synth One from AudioKit is awesome. It is a free, open source synthesizer. I think the source code is available to everyone. AudioKit also sells several software synths that support the making of Synth One.
I have quite a bit of guitar stuff also, but that is another topic.
I generally record in Garageband and the newer iPad Pro that has the USB-C connector.