This is similar to blackarch-decompiler, and there will probably be a lot of programs that fall into both, however these packages produce assembly output rather than the raw source code.

Tool count: 13

BlackArch disassembler
Name Version Description Homepage
abcd 4.2738809 ActionScript ByteCode Disassembler.
binnavi 6.1.0 A binary analysis IDE that allows to inspect, navigate, edit and annotate control flow graphs and call graphs of disassembled code.
binwalk 2.1.1 A tool for searching a given binary image for embedded files
chiasm-shell 20.0e87c54 Python-based interactive assembler/disassembler CLI, powered byKeystone/Capstone.
libdisasm 0.23 A disassembler library.
marc4dasm 6.f11860f This python-based tool is a disassembler for the Atmel MARC4 (a 4 bit Harvard micro).
plasma 901.432cac6 An interactive disassembler for x86/ARM/MIPS. It can generates indented pseudo-code with colored syntax.
pwntools 3.12.0 CTF framework and exploit development library.
radare2-keystone 405.9214455 Keystone assembler plugins for radare2.
scratchabit 483.72da2e8 Easily retargetable and hackable interactive disassembler with IDAPython-compatible plugin API.
smali 2.2.4 Assembler/disassembler for Android's dex format
unstrip 13.05e00c2 ELF Unstrip Tool.
viper 1742.5cf7007 A Binary analysis framework.