I don't see a whole lot of difference between the BSD and Apache licenses and just putting software in the public domain. And maybe also tacking on a SHOUTY ALL

I don't see a whole lot of difference between the BSD and Apache licenses and just putting software in the public domain. And maybe also tacking on a SHOUTY ALL-UPPERCASE DISCLAIMER OF LIABILITY so you don't get sued for not having a shouty all-uppercase disclaimer of liability. The GPL does have some extra requirements, in the form of source code sharing requirements for derivative works, but judging by how many people use more permissive open-source licenses, the difference here seems to be pretty slight in practice.