SkoolKit is a collection of utilities that can be used to disassemble a Spectrum game (or indeed any piece of Spectrum software written in machine code) into a format known as a skool file. Then, from this skool file, you can use SkoolKit to create a browsable disassembly in HTML format, or a re-assemblable disassembly in ASM format. So the skool file is - from start to finish as you develop it by organising and annotating the code - the common 'source' for both the reader-friendly HTML version of the disassembly, and the developer- and assembler-friendly ASM version of the disassembly.

SkoolKit requires Python 3.4+. If you're running Linux or one of the BSDs, you probably already have Python installed. If you're running Windows or Mac OS X, you can get Python here.

SkoolKit can:

• convert a TAP or TZX file into a 'pristine' snapshot (using tap2sna.py)
• disassemble SNA, Z80 and SZX snapshots as well as raw memory files
• distinguish code from data by using a code execution map produced by an emulator
• build still and animated PNG/GIF images from graphic data in the game snapshot (using the #UDG, #UDGARRAY, #FONT and #SCR macros)
• create hyperlinks between routines and data blocks that refer to each other (by use of the #R macro in annotations, and automatically in the operands of CALL and JP instructions)
• neatly render lists of bugs, trivia and POKEs on separate pages (using Bug, Fact and Poke sections in a ref file)
• produce ASM files that include bugfixes declared in the skool file (with @ofix, @bfix and other ASM directives)
• produce TAP files from assembled code (using bin2tap.py)

See the user manual for more details (mirror here).