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Logo (https://logo.shapefactory.co) isn't free, and it's rather generic, but I like it.

Shapefactory (https://shapefactory.co) (makers of Logo) also have some free color picking tools.

Hi! The author here :) I recommend just using a text logo for starters. With maybe an icon from flaticon.

Here's one from Shopify that should be decent https://www.shopify.com/tools/logo-maker

Not free, but I've had good luck with artists on Fiverr. Granted, they're not always unique, but quick and cheap.

Good point

There is a subreddit where you can request free logos. Not sure which it was