I want to support artist and gamemaker on itch.io, but I can't donate because I'm a student and I have no income. I would therefore like to know if it is possible to support artist or gamemaker without donate.

Giving a good rating and a nice comment should be fine.

You can always share and recommend his games in social media. That's totally free and I'm sure he/she will appreciate that.

Thanks to both of you for your replies.