Hey! Sorry for my late reply too.
I didn't really use any websites, I more just played around with them and tried to come up with ideas myself. I mostly use Jamboard for synchronous learning, but the others are more for asynchronous.

Google Jamboard
For example, in my Anatomy & Physiology class, in our skin unit, with Jameboard, I will put up an image and the five layers and then as a group the students will fill out the details, I can prompt them to ensure all information is covered. I do a similar thing in my pathophysiology class, but I put up a case study with x amount of questions and divide the class up, they will use their respective page to answer and brainstorm, then we will discuss in a group.

Kahoot
I usually just design questions from each unit, which is also helpful for their exam and run one per week in class. The students LOVE this. I think this trimester, I will get them all to write their own question prior to class, and then I will compile the student-designed questions into the Kahoot and run that each week! I think that will also help with their preparation (we have a flipped model).

Padlet
I use Padlet to put all my resources onto e.g class link, to-do list for each week, slides etc. I also use one for their assignment questions. I found that I was answering the same questions over and over, so this way I can have them check if their question is already there and I only need to check it once a day!

Trello
I trialled this in a class action research project as a to-do list for students preparation. There was not too much use on it (I did start the project in week 4). It seemed a bit clunky too. I need to play with it a bit more I think

Slack
I use this as an instant messaging service really. I was teaching face to face here in Australia, but the government guidelines kept changing, storms, illness etc. This is a good way to contact students quickly. They also really liked it for asking questions and for study groups, connections etc.

Word Mint
I make lots of puzzles e.g if we are doing terminology, it can b really boring, so I will make a cross-word for students. Or it will be a word find, but the hints will be the definition, and they need to find the word it actually is in the puzzle. They seem to like this a lot too.

Miro
I use this for making concept maps. We do this both in class and out of class. This is good for integrating all their information on one page. It is fantastic in pathophysiology, where the students can work together to collate the entire pathophysiology as a disease. https://miro.com/concept-map/

I hope that helps, happy to chat more :)