Front end and mobile:
Angular 1 (Ionic) Backbone.js (At the time it was the best) Example project: http://4d.rtvslo.si/ Angular 2 (Learning and will use in future projects. There are also some great seed git projects. Also with Ionic 2) ReactJS (Done some simple stuff . Will learn when they will improve CLI and build process) Reactive (Widgets similar to react)
Backend:
Node with ExpressJS (Easy to learn and use). When I master generators will probably head to Koa.
Other:
jQuery off course and many other... :)