Extend — Android apps for

SystemExtend is an all-purpose display manager for any physical or virtual display.

EducationEmulator of "Electronika МК 61/54" RPN programmable calculators.

SocialSpam Call/SMS/Notification blocker

GamesMake your way through an extended version of Snake with computer-controlled oppo

DeveloperTermux - a terminal emulator application for Android OS extendible by variety of packages.

SystemeXtended Permission Manager - a small app to manage permissions and AppOps

DeveloperTTS engine with extended languages support (incl. Russian)

Reading & ComicsThe extendable novel reader for Android.