acousticgender.space (it gets affected by accents and can only reliably parse English but it's a great tool for comparing different voices you do)

https://www.evernote.com/shard/s204/sh/a412f232-e612-439c-b01e-9054631c31e3/971c206b31f0c3dad156c16de159609b - Detailed document for beginners. Explains the anatomy of voice training too which really helped me(voice trained to hide I'm on T).