Native tabs, panes. And the keyboard shortcuts for handling them is super intuitive.
Some innovative keyboard functionalities. E.g., highlighting all the URLs in the current buffer, so I can open it in the browser with just keyboard shortcuts, same for file paths. One keyboard shortcut let's you open the last output in a pager. So I don't have to `previous-cmd | less` again. There are a lot of small stuff like this.
Configurable to its core.
Broadcast feature which lets you print output to multiple panes.
Plugins (called kittens!) which can extend the functionality a lot. Like ctrl+f in the terminal.
And as the sibling mentioned, well maintained. Kitty is one of the softwares on my "donate-to-when-financially-stable" list.
Kitty, the terminal emulator by Kovid Goyal
wouter, a minimal JS routing library
espanso, a text expansion program
KDE Connect
Tailscale
The last 2 together
curl