Retro emulators
ZX Spectrum 48K, 128K, +2E/+3E and Cambridge Z88, with the ZX Spectrum Next on the way.
Klive IDE is a retro computer emulator and Integrated Development Environment running on Mac and Windows.

ZX Spectrum 48K, 128K, +2E/+3E and Cambridge Z88, with the ZX Spectrum Next on the way.
Breakpoints, stepping, memory and disassembly views, CPU and machine state panels, and a multi-pane code editor.
A full-featured Klive Z80 assembler with macros, structs and ZX Spectrum Next extensions.
Write, build and debug ZX BASIC programs right next to your assembly code.