If you're looking for a Photoshop alternative, Clipdrop is worth a look. It's got a range of AI tools, like removing backgrounds, upsizing images and generating images from text prompts. It's got a clean interface that's good for pros and amateurs, and it offers a free trial so you can try it out.
Another good option is VanceAI. It's geared for photo editing and enhancement with AI tools like upscaling, sharpening, denoising and background removal. It's also got some more unusual tools to turn photos into cartoon or sketch styles, so it's good for people who have to process lots of photos and need high-end results.
If you want an all-purpose online photo editing suite, check out Pixlr. Pixlr has a variety of tools, including the Pixlr Editor for serious editing, Pixlr Express for quick tasks and Pixlr Designer for templates and animations. It's got batch editing abilities and a variety of AI tools like face swapping and object removal, and it works on the web, desktop and mobile.
Last, InPixio offers a full-featured photo editing package with AI tools like object erasure, background removal and photomontage design. It works on multiple platforms and has a free version that's limited in power, so it's a good option for people who want to try out advanced editing techniques without committing to a paid subscription.