SjasmPlus

Here are the informations presented on the official website :

SjASMPlus is Z80 Assembly Language Cross Compiler. It is available for Win32, Linux and FreeBSD (mainly 5.x) systems. It is based on SjASM source code by Sjoerd Mastijn (http://xl2s.tk).

• Full source of assembler available under BSD license, modify and extend as you wish
• Z80/R800/Z80N/i8080/LR35902 documented and undocumented opcodes support
• Macro language, defines, array of defines
• Built-in Lua scripting engine
• Conditional assembly, block repeating
• Modules (namespaces), local and temporary labels
• Source and binary file inclusion, include paths
• Multi file output, file updating, various types of exports
• Structures to work easily with structured data in memory
• Relocation data generator to support SymbOS-like relocation of executables
• Virtual device mode for common machines: ZX 128, ZX Next, Amstrad CPC, … (pseudo op DEVICE)
• ZX Spectrum specific directives and pseudo ops (SAVESNA, SAVETAP, SAVEHOB, INCHOB, INCTRD…)
• ZX Spectrum Next specific features and directives (Z80N, 8ki memory paging, SAVENEX)
• Amstrad CPC 464/6128 specific directives (SAVECPCSNA)
• Correctness is assured by Cirrus-CI with 400+ automated tests (that's also 400+ examples of usage!)
• Fake instructions as LD HL,DE (LD H,D:LD L,E) and more
• Code inlining through colon (LD A,C:INC A:PUSH AF:IFDEF FX:LD A,D:ENDIF…)
• Very fast compilation: 1 million lines by 2-3 seconds on modern computer
• Multiline block comments and user’s messages

• Sources : https://github.com/z00m128/sjasmplus
• Documentation http://z00m128.github.io/sjasmplus/documentation.html
• Old Web site : sjasmplus.sourceforge.net/