For me it’s: Testdisk (and Photorec) Caddy Netstat Dig Aria2
Rclone. Not because it’s a complicated tool, but because I would like a history of my file transfers and a few graphs to show we what speeds, files sizes and whether the transfer succeeded. At the moment in order to confirm my home backups have succeeded, I have to run a separate size comparisons between my different datastores.
Thanks. I think I looked at doing that when setting it up, and it was more expensive in terms of API calls. With a cloud vendor you have to be careful of that, so I opted for the SIZE command.
Probably not what you want, but rclone now has a simple web ui built in: https://rclone.org/gui/