It is public domain software.
Repository: https://github.com/hu-dwim/hu.dwim.syntax-sugar
read-macros is a similar library.
cl-syntax-sugar
cl-syntax-sugar is a convenience library of reader macros and of helper functions to create new syntax extensions and to use them with ASDF and Slime without enabling them in the global readtable.
read-macros is a similar library.
read-macros is a similar library.