> My most used tool I have is a note taking web app that automatically saves markdown files to S3. The most important feature I added was a little button that would automatically make a note for the current day, and put it in the daily notes folder, all sorted and organized. I also have full text search which is very helpful for finding old notes.

I have a very similar thing, mine uses a dropbox folder as a backend so I can easily browse on laptop and use whatever. I like the daily notes idea though!