These tools are , and widely used in academia. TeXstudio, in particular, rivals WinEdt in features and stability.
Technically, WinEdt does not stop working after the trial period expires. It will continue to launch, but it will display a nag screen upon startup and occasionally interrupt your work. If you are using it for light editing and can tolerate the interruptions, you can legally continue using it without a key, provided you do not try to hack the registry to remove the nag screens.
Before you start downloading keygens or searching for cracked serial numbers on shady forums, it is vital to understand the risks, the legalities, and the legitimate ways to use WinEdt without breaking the bank (or the law).
The developer offers significantly reduced pricing for students and educational institutions.