They say they're going to release the long-awaited volume on the Original Manuscript this month.https://www.josephsmithpapers.org/articles/revelations-volume-5-original-manuscript-of-the-book-of-mormonThat one is edited by Royal Skousen, who is an awesome, meticulous scholar. I highly recommend his factual work, although I disagree with a lot of his assumptions and conclusions. Sometimes it's not easy to separate the facts from the speculation, but if you read carefully you can.
The Wilford Woodruff collection is awesome. I used to have to read through the typescript manuscript of his journals, so this resource is invaluable.
You can upload your own databases, which is incredibly useful.The only drawback is they won't put it on Android, so I only use it on my PCs and iPad.
It runs on Android, so I use it on my phone all the time. They're always adding new features, etc.