First of all, great thread idea! I love having a range of other patterns to look at!
I personally mainly use
https://www.allfreesewing.com/ because it's free and has a lot of patterns, but the ads on there do get a little annoying and it runs slowly on the computer I use. I have used quite a few of the dress patterns on there though.
Edit: I also discovered
https://www.lekala.co/ today and it's very easy to use (In my opinion at least)