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.
SmallDevTools - Handy developer tools with a delightful interface
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.
LaunchKit - Open Source - A popular suite of developer tools, now 100% open source.
LinkedIn Learning - Online training through LinkedIn's professional network.
Profitable developer tools database - A database of 103+ hand-curated profitable developer tools