Why do you need something similar to Latte Dock? Why can’t you just use Latte dock?
Apps: I’m looking for alternatives to ShareX, Fan controller, Flow launcher any other helpful tool similar to them.
FlameShot is a great alternative for ShareX, I don’t really know about Fan controller, but KDE has a built-in replacement for Flow launcher called KRunner. By default, you should be able to launch it with Alt + Space. If not, check the Keyboard shortcut page in the system settings.