Nexen

Paid LinuxMacWebWindows

What Nexen is

Nexen is a free, open source multi-system emulator for Windows, Linux, and macOS. It lists eight fully supported systems: NES, SNES, Game Boy and Game Boy Color, Game Boy Advance, Master System and Game Gear, PC Engine, WonderSwan, and Atari Lynx. Its CPU and PPU emulation is cycle-accurate, with full coprocessor support listed for several SNES chips. Sega Genesis, Atari 2600, and Fairchild Channel F support are in progress.

For each game, Nexen provides unlimited timestamped save states, a visual picker, and 36 rolling checkpoints taken at five-minute intervals. Its movie tools support frame-by-frame recording and playback, rerecording, and import or export for BK2, FM2, SMV, LSMV, VBM, and GMV formats. The tool-assisted speedrun editor includes a piano-roll timeline, undo and redo, greenzone seeking, alternate branches, and Lua scripting.

Debugging tools include a disassembler, memory viewer, breakpoints, trace and code/data loggers, and a profiler. Nexen also lists rollback netplay. It exports symbols, code coverage data, cross-references, and source maps in Pansy metadata format for the Flower Toolchain. GitHub Releases provides pre-built Windows, Linux, and Apple Silicon macOS binaries.

Who it suits

Nexen suits players who want a multi-system emulator with detailed save, movie, and debugging tools. Its TAS editor, scripting, and rollback netplay also fit users interested in tool-assisted play or multiplayer.

What it does well

Eight console systems are listed as fully supported.
Unlimited timestamped saves and 36 rolling checkpoints per game.
Movie recording supports six named import and export formats.
TAS editor includes branching and Lua scripting.
Rollback netplay is listed as a feature.
Exports symbols and source maps for the Flower Toolchain.

What to know first

macOS Intel builds are no longer provided.
Linux builds require SDL2.
Three additional systems remain in progress.

Getting started

Open the Nexen GitHub repository.
Go to GitHub Releases for a pre-built binary.
Choose the build for Windows, Linux, or Apple Silicon macOS.
On Linux, make sure SDL2 is available.

Verdict

Choose Nexen if you want broad console coverage alongside save management, movie tools, debugging, and rollback netplay. Check platform support before downloading if you use an Intel Mac or a Linux setup without SDL2.

Questions

How much does Nexen cost?

Nexen is free and lists a free plan.

Which systems does Nexen support?

It lists NES, SNES, Game Boy and Color, Game Boy Advance, Master System and Game Gear, PC Engine, WonderSwan, and Atari Lynx as fully supported.

Which platforms have pre-built binaries?

GitHub Releases lists Windows, Linux, and Apple Silicon macOS builds. macOS Intel builds are no longer provided.

Is Nexen open source?

Yes. The project says its additions are released under The Unlicense, while the base code remains under GPL v3.

Does Nexen support multiplayer?

Yes. Nexen lists netplay multiplayer with rollback.

Facts from Nexen's own pages

Community support: The README invites users to GitHub Discussions to discuss progress, share ideas, and suggest changes. · github.com, 7 Oct 2026
Debugging: Debugging tools include a disassembler, memory viewer, breakpoints, trace logger, code/data logger, and profiler. · github.com, 7 Oct 2026
Dependencies: Linux builds require SDL2, while the listed source-build requirements include a C++23 compiler and .NET SDK 10.0 or later. · github.com, 7 Oct 2026
Development status: Sega Genesis, Atari 2600, and Fairchild Channel F support are listed as in progress. · github.com, 7 Oct 2026
Downloads: The project directs users to GitHub Releases for pre-built binaries and lists Windows, Linux, and Apple Silicon macOS builds. · github.com, 7 Oct 2026
Emulation: It offers cycle-accurate CPU and PPU emulation and lists full coprocessor support for several SNES chips. · github.com, 7 Oct 2026
Integration: Nexen exports symbols, code coverage data, cross-references, and source maps in Pansy metadata format for the Flower Toolchain. · github.com, 7 Oct 2026
Integrations: Nexen exports symbols, code/data logging, cross-references, and source maps to Pansy as part of the Flower Toolchain. · github.com, 7 Oct 2026
License: The project says its additions are released under The Unlicense while the base code remains under GPL v3. · github.com, 7 Oct 2026
Movies and TAS: The movie system supports frame-by-frame recording and playback, rerecording, and import/export for BK2, FM2, SMV, LSMV, VBM, and GMV formats. · github.com, 7 Oct 2026
Movie tools: Nexen supports frame-by-frame movie recording and playback with rerecording, and imports or exports BK2, FM2, SMV, LSMV, VBM, and GMV formats. · github.com, 7 Oct 2026
Multiplayer: Nexen lists netplay multiplayer with rollback as an emulation feature. · github.com, 7 Oct 2026
Networking: The README lists netplay multiplayer with rollback as a feature. · github.com, 7 Oct 2026
Platform limitation: The repository says macOS Intel builds are no longer provided, and macOS Native AOT is temporarily unavailable. · github.com, 7 Oct 2026
Platform limits: The README says macOS Intel builds are no longer provided and non-AppImage Linux builds require SDL2. · github.com, 7 Oct 2026
Product: Nexen is a multi-system emulator for Windows, Linux, and macOS. · github.com, 7 Oct 2026
Save states: It provides unlimited timestamped saves per game, a visual picker, and 36 rolling checkpoints at five-minute intervals. · github.com, 7 Oct 2026
Supported systems: The README lists NES, SNES, Game Boy and Color, Game Boy Advance, Master System and Game Gear, PC Engine, WonderSwan, and Atari Lynx as fully supported. · github.com, 7 Oct 2026
TAS editor: The editor includes a piano-roll timeline, undo and redo, greenzone seeking, alternate branches, and Lua scripting. · github.com, 7 Oct 2026