1. Buy Me a Coffee
Integration is as simple as embedding a button anywhere on your webpage. You can see it in action on netgames.io/games
The setup is super easy, there is no monthly fee but they take 5% of every transaction. Integrates well with Stripe and PayPal.
It's a similar service to Buy Me a Coffee, here you can see a detailed comparison of the two rigorousthemes.com/blog/ko-fi-vs-buy-me-a-c..
Ko-fi lets you create a little portfolio on their platform that can serve as a hub for accepting payments.
Once this portfolio of yours is ready you can start sharing it everywhere and accepting donations.
Flattr is a great way to accept sponsorships for your open source repositories. It accepts one time & monthly recurring payments
recurring donations platform, no fees aside from payment processor fees (PayPal and Stripe)
5. Hashnode Sponsors
If you're blogging on @hashnode Hashnode Sponsors is the easiest way to get started with donations. It integrates with Stripe and you can enable it for your blog with a click: