lbl
I've moved this project to NotABug.org. I still think Fossil is a better choice technically, but the world and his mother are now using git.
Lbl preprocesses symbolic labels for troff(1) text. I like it for technical documentation, in conjunction with groff and prag.
Lbl is copyright C.D.F. Miller of Heriot-Watt University, see [7e86c32dd322f91108d0e51659978696e15c6b2f|NOTICE] for details. I am merely updating it slightly to compile with modern C11 compilers.