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Yasm is a (mostly) BSD-licensed assembler that is designed from the ground up to allow for multiple assembler syntaxes to be supported (e.g. NASM, GNU AS, etc.) in addition to multiple output object formats and multiple instruction sets. Its modular architecture allows additional object formats, debug formats, and syntaxes to be added relatively easily.
Yasm started life in 2001 as a rewrite of the NASM (Netwide) x86 assembler under the BSD license. Since then, it has matched and exceeded NASM's capabilities, incorporating features such as supporting the 64-bit AMD64 architecture, parsing GNU AS syntax, and generating STABS, DWARF2, and CodeView 8 debugging information.
Yasm is primarily licensed under the 2-clause and 3-clause “revised” BSD licenses, with two exceptions. The NASM preprocessor is imported from the NASM project and is thus LGPL licensed. The Bit::Vector module used by Yasm to implement Yasm's large integer and machine-independent floating point support is triple-licensed under the Artistic license, GPL, and LGPL. The full text of the licenses are provided in the Yasm source distribution.
This user manual is licensed under the 2-clause BSD license, with the exception of Chapter 2, Chapter 3, and Chapter 4, large portions of which are copyrighted by the NASM Development Team and licensed under the LGPL.