The CD-ROM included with Assembly Language Step-by-Step, Second Edition includes the following items:
The x86 NASM assembler for DOS
The x86 NASM assembler for Linux
Anthony Williams's ALINK free linker for DOS
Robert Anderton's NASM-IDE programming environment for DOS
All the example programs presented in the book, in source code form
The author's JLIST10 LaserJet source code print utility