AddThis is a social bookmarking service that can be integrated into a website with the use of a web widget.
BEM (Block, Element, Modifier) is a naming convention for classes in HTML and CSS what was developed by Yandex.
OpenResty is a web platform based on nginx which can run Lua scripts using its LuaJIT engine.
Progressive Web Apps (PWAs) are web apps built and enhanced with modern APIs to deliver enhanced capabilities, reliability, and installability while reaching anyone, anywhere, on any device, all with a single codebase.