I stumbled across a project and saw this Unlicense:
This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.

In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

For more information, please refer to <http://unlicense.org/>
It has the same purpose as WTFPL does.

There is a long post from the creator of this license, it's too long and I didn't read it all. The website Unlicense.org isn't accessible as of writing, but I found the source code of the website. There is also a Google Group for discussions.

I don't know if this Unlicense is dying since it didn't get approved by OSI or FSF. But I prefer WTFPL over Unlicense, although "Unlicense" sounds cool, but "WTF" is more awesome.

I don't care much about licensing (and I know pretty much nothing about it) when I intentionally place my work into Public Domain. Just let everyone do WTF they want to my stuff. Unfortunately, Public Domain isn't covered by law in everywhere, therefore you need to license your work in order to make sure you can have same effect as if you put works into Public Domain.