GB Studio is a production-grade Electron desktop application for creating Game Boy and Game Boy Color games without writing code. It is a full visual IDE: scene and tilemap editors, sprite/metasprite editor, a music tracker with piano roll and instrument editing, a script event system (event definitions compile to GBVM bytecode), asset management for backgrounds/sprites/tilesets/fonts/sounds, and a debugger with ROM usage analysis. A separate web app (GBS Music) shares core music logic and offers a standalone browser-based tracker. The application is architecturally substantial: the Electron main process hosts multiple isolated renderer windows (splash, project, music, preferences, plugins), the renderer uses React 19 with Redux Toolkit for normalized entity state, Web Workers offload image processing and background scans, and a shared lib layer is reused across desktop and web builds.
bsnes is a multi-platform Super Nintendo / Super Famicom emulator with an integrated Game Boy core (SameBoy) used for Super Game Boy support and also buildable as a standalone or libretro core. The desktop frontend in target-bsnes loads ROMs, applies BPS/IPS patches, manages save states and rewind, records movies, provides cheat search/editing, maps input, and applies video shaders. The emulation layer in bsnes/sfc is extensive: cycle-accurate CPU/PPU/DSP/SMP, a high-performance alternate PPU, and a broad collection of coprocessor emulations (SA-1, SuperFX, CX4, DSP-1/2/4, SPC7110, SDD1, MSU1, and others). ROM identification is heuristic and normalized into manifests, after which CPU, coprocessor, and PPU threads are synchronized to produce frames, with audio/video/input isolated behind the ruby driver layer.