Screenshot of Adobe Flash CS4 running on Windows 7 Ultimate 32 bit
Adobe Flash aka Adobe Animate (formerly called Macromedia Flash and Shockwave Flash) is a multimedia software platform for the production of animations, browser games, rich Internet applications, desktop applications, mobile applications and mobile games.
In parodies
Several Flash games appears in some AGK series. e.g. In TheKewlOne96, Ivan187 and some others' series, Leopold plays The Impossible Quiz and ends up failing.
UsefulAGKHelper also uses Flash to make AGK videos, notably the animations.
Atekuro first used Adobe Flash Professional CS6 for his old AGK Series in Episodes 2 to 4. He then switched to Adobe Animate CC 2018 for the rest of Episode 4. He later switched to Adobe Animate CC 2019, then CC 2020 for a short period of time before switching back to the version he's been using currently.
YumaSonic2016 uses in Adobe Animate CC for his AGK series animations.