https://www.reddit.com/r/AskReddit/comments/q2viki/what_usef....
A few from the list:
1. https://thispersondoesnotexist.com/ (Imagined by a GAN StyleGAN2 (Dec 2019) - Karras et al. and Nvidia. More: https://github.com/NVlabs/stylegan2)
2. https://www.deepl.com/translator (translate text in 20 languages including idioms and phrases)
3. https://remove.bg/ (remove any background)
4. regex101.com (self explanatory)
5. Photopea.com (a free web-based Photoshop alternative
6. https://tineye.com/ , http://fotoforensics.com/ Do you want to know if an image is shopped, cropped or otherwise altered? Using these two tools you've got a good chance of finding out. Tineye is reverse image search on steroids and foto forensics provides free image analysis tools:
7. https://thenounproject.com/ (Icons and Photos for everything)
8. https://www.readsomethinggreat.com/ (Timeless articles from the belly of the internet. Manually created)
9. https://rsoe-edis.org/eventMap (RSOE-EDIS is a live world map of emergencies. Icons represent fires, tornadoes, earthquakes, plane crashes, biological endemics, public safety incidents, animal attacks, and more)
10. http://sleepyti.me (Sleep Cycle Calculator - Optimal Bedtime and Wake up Times by Age)