ATasm is a 6502 command-line cross-assembler.
BeaEngine disasm project
CSS validation and advanced preprocessor with nesting and variables
Keystone assembler framework: Core (Arm, Arm64, Hexagon, Mips, etc.)
toolchain for obfuscated compilation
A machine code manipulation library for Intel 64 and IA-32.
Cross-platform 6502 assembler
A Java VM for ARDUINO and other micros using the leJOS runtime.
Libraries for CPC game development under z88dk and SDCC
Creates APNG animation from PNG/TGA image sequence.
Collection of macros and libraries in assembly
BCPL was designed by Martin Richards at Cambridge University (1966)
Deconstruct APNG file into a sequence of PNG frames.
A kit for cross-platform & embedded development in modular languages.
An assembler and disassembler for the JVM (Java Virtual Machine)
Japheth's assembler, JWasm
LEGO EV3 Utilities and Assembler
Assembler and linker for STM8 microcontrollers.