Chromebooks not only deliver a quick-to-boot browser but also let you install and run Android apps. You can run many apps for older platforms within the Chrome browser, and the combination of Android apps and browser access opens up a huge world of Chromebook emulators.
Chromebooks that launched in or after 2019 support Android apps; see Chrome OS Systems Supporting Android Apps for the list of older devices that also run these apps. If you received yours from school or work, an administrator may manage or limit which apps you may install or access.
A Free PSP Emulator: PPSSPP - PSP Emulator
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Useful and detailed product support site.
Updates tend to fix many specific issues.
Some settings can cause graphics or audio issues.
Updates not as frequent as some people might prefer.
Unlike many PlayStation Portable (PSP) emulators, the free PPSSPP - PSP emulator includes easy access to a variety of homebrew apps and demos you may download, all for free. Of course, you can use your own files, too. The app lets you adjust a huge number of graphics, audio, networking, and other system settings.
A paid version of the PPSSPP emulator allows you to support the developers who maintain this emulator. For anyone who uses the app and can afford it, this provides a financial incentive to the developers to fix bugs, improve compatibility, and continue to maintain the app.
Play NES or SNES Games: John NESS
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Access to two emulators within the app.
Manageable number of settings.
Updated version added ads.
Key mappings can be complicated to configure.
John NESS delivers an emulator intended to work with both Nintendo Entertainment System (NES) and Super Nintendo Entertainment System (SNES) games. The app includes ads, which may be removed with an optional upgrade.
Nintendo 64: M64Plus FZ Emulator
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Links to setup and controller mapping guides.
Access to many adjustable settings.
Different profiles may be needed for different games.
The M64Plus FZ Emulator app lets you run many Nintendo 64 games. It offers many controls you may customize, as well as links to a few guides that walk you through setup and configuration.
Play Nintendo DS Games: DraStic DS Emulator
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Plenty of configuration options.
Detailed help and instructions.
No WiFi or multiplayer support.
No free trial or test version.
This paid Nintendo DS emulator offers some customization, so you may adjust and play games at larger-than-original resolution. The app supports many custom video, audio, and controller settings you can adjust, and allows you to enable support for cheat codes.
Play GBA or GBC Games: John GBAC
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Access to two emulators within the app.
Settings offer several options.
Lacks multiplayer support.
Not all games and controllers work on all systems.
Like its counterpart listed above, John GBAC delivers an emulator for both Game Boy Advance (GBA) and Gameboy Color (GBC) games. You may use the app for free with ads, or pay a one-time fee to remove them.
Best Commodore 64 Emulator: Mobile C64
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Can type in programs with Commodore 64 Basic.
Easy-to-access overlay controls for gaming.
Keyboard doesn’t remap modern layout to Commodore 64 settings (e.g., quote key is Shift-2 as it was on the C64).
Commodore 64 style function keys not present on Chromebooks.
Mobile C64 lets you type in and run Commodore 64 Basic apps, as well as load and run any Commodore 64 games you may have. The app includes a few large overlay areas for controls and settings for emulated storage, so you don’t have to search for now hard-to-find 5-¼” floppy disks.
Desktop as a Service: Amazon WorkSpaces
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Full access to a remote Windows system.
Can install many Windows apps.
Reasonably fast internet connection needed.
Cost may be a barrier for some people.
Amazon WorkSpaces delivers cloud desktops, which means you can sign up for the service and then access your WorkSpace from a Chromebook or almost any mobile, tablet, or desktop computer.
You can install and configure Windows apps in your WorkSpace, and while most apps and games work, some with specific graphics requirements may either require customization or just not work. The Amazon WorkSpaces Pricing page details hourly and monthly pricing for a huge range of remote computer configurations.