Is there any software to display daily tasks on the computer desktop?

There are many, you can decide according to your needs:

If you just want to put it on the desktop, you can see your planned tasks every day without many tips or functions, then the post-it function that comes with the system can satisfy you. All programs-attachments-comments. You can change the font size and prompt location.

If you want to be fully functional. Then I recommend the life calendar. The main functions of the software are:

Lunar calendar, solar calendar and yellow calendar (trunk calendar) query

weather forecast

Holidays and holiday arrangements

notebook

Reminder function

Custom festival

Yun post-it notes

Application box

Of course, there are many professional software, but I recommend it because it won't take up extra screen space and the time bar will appear when you need it. Combined with the perpetual calendar, it is very easy to use and clear at a glance.