Upcase by thoughtbot - An online learning platform for developers - now free
CISSP Pocket Prep - CISSP Pocket Prep app is a digital exam simulator through which users can create customizable practice tests with a detailed explanation of the answer to each question so they can immediately view results.
PracticeLinux - Learn Linux, Vim, Git, Tmux, Gpg and more
LinkedIn Learning - Online training through LinkedIn's professional network.
Enbitious - An online business learning marketplace that helps all ambitious entrepreneurs to learn & network.
CompTIA Security+ Pocket Prep - CompTIA Security+ Pocket Prep app comes up with features to help users in creating customized practice tests so they can practice for their upcoming exams right through their mobile phones.