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:The official closed-source implementation by Adobe, who discontinued it in 2020. The web version relies on [[wikipedia:NPAPI|NPAPI/PPAPI]], an obsolete in-browser plugin system that for many years only stuck around specifically because of this Flash plugin; when the plugin was officially dropped by Adobe, so too was the plugin system dropped by all the major browser vendors. The desktop player version is still available for download from the Adobe website's debug downloads section, and Harman International is also [https://airsdk.harman.com/flashplayer maintaining an extended support version specifically for enterprise users].:;CheerpX for Flash::A payware HTML5 emulation package which combines CheerpX, an x86 emulator in WebAssembly, with Harman International's extended support version of Adobe Flash Player. No-one on this wiki has formally evaluated it (yet), but you shouldn't expect amazing performance given the added complexity of such an approach. ;WAFlash:A closed-source C++-to-HTML5 implementation that technically hasn't been officially released yet, and will probably be payware once it is. It seems to be the most accurate of the unofficial emulators as of December 2021.

:A pure An open-source Rust implementation mainly targeting HTML5, but also available as a desktop player. The devs are planning to focus on ActionScript 1 and 2 support first, with AS3 support coming later. Development of Ruffle is sponsored by multiple veteran Flash game archives, most notably Newgrounds. It mainly targets HTML5, but is also available as a desktop player. It's progressed to the point where it can run many early Flash games, including the original Flash version of [https://www.newgrounds.com/portal/view/59593/format/flash?emulate=flash Alien Hominid], as well as playing the vast majority of [https://old.homestarrunner.com Homestar Runner] toons. Notably, unlike the other HTML5 options, Ruffle can be installed as a browser addon using the WebExtension system, although it won't always override the copy that a website may be hosting. ;AwayFL:An open-source HTML5 implementation developed by the Away Foundation, under sponsorship from Poki.com. Sometimes works better than Ruffle, depending on the specific Flash file you're trying to run.

;Lightspark & Gnash:Two An open-source C++ implementations implementation that somewhat complement each other, and are both 's designed specifically to provide a drop-in FLOSS alternative to both the desktop and NPAPI versions of Adobe's official playersFlash Player. Lightspark says Says it has 7879% of the APIs covered, while Gnash has focused on older versions as of Flash that Lightspark is less likely to support properly, hence why Lightspark can use Gnash as an automatic fallback if both are installed simultaneously. Lightspark's external dependencies would make it cumbersome to port it to HTML5, so it's only available in browsers as an NPAPI/PPAPI plugin, similar to the official one from AdobeJanuary 2022.

:An open-core HTML5 implementation that uses a dynamic recompiler. The opensource-source available "Free Version" version supports limited features, such as AS1, AS2 and ZLIB compression, whereas the payware "Production Version" supports further version is better suited to newer Flash files using such features, such as AS3 and LZMA compression. Uses normal JavaScript rather than WebAssembly, so performance is less than ideal.

;CheerpX for FlashShumway:A payware relatively very early HTML5 emulation package which seems to work by running a binary Flash plugin inside an x86 emulatorimplementation. CheerpX is marketed exclusively towards website operators and is clearly not intended Developed rather actively for personal use. As of December 2021a few years under Mozilla sponsorship, this is the only emulator being endorsed but ultimately abandoned in any way by Adobe or its partners (specifically, by Harman International [https://airsdk.harman.com/ on their Flash & AIR developers site])2016 before it could reach a usable beta state.

;ShumwayGNU Gnash:A An open-source desktop player that has made very little progress since early HTML5 implementation2012. Developed rather actively for a few yearsIt focuses on older versions of Flash that Lightspark was originally less focused on supporting properly, under Mozilla sponsorshiphence why Lightspark could use Gnash as an automatic fallback if both are installed simultaneously. However, newer versions of Lightspark have all but ultimately abandoned in 2016completely superseded Gnash and there's not much reason to use it anymore.