Lynx

Lynx is a text mode browser. I know it's used by the blind as text to speech can be used to navigate it.

While the requirements are viewed as 'light' for Lynx on modern systems, building it on 4.3 BSD was a challange, as there is a massive switch statement that would break the default assember (even with -J flags). So I was required to build gcc up to version 2.7.2.2 then build binutils 2.8.1, then rebuild gcc to use the new binutils to finally have a toolchain that was capable of building lynx on 4.3 BSD.