Upcase by thoughtbot - An online learning platform for developers - now free
LinkedIn Learning - Online training through LinkedIn's professional network.
PracticeLinux - Learn Linux, Vim, Git, Tmux, Gpg and more
AWS Certified Solutions Arch. - AWS Certified Solutions Arch App allows you to access an extensive collection of more than 320 exam questions so you can prepare yourself for AWS exams.
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.