Open Source Software for Android
Bliss OS
Bliss OS is a free and open-source operating system based on the mobile operating system, Android. It features many optimizations and expanded device support and is avalible for Chrombook, Linux and Windows PCs. The project is developed by an 501 (c3) Non-Profit organization who's mission is to provide a variety of resources to the open-source community and others around the world by creating and fostering an all-inclusive learning environment for seasoned developers and newcomers.
Tutanota
Tutanota is the world's most secure email service, easy to use and private by design. Tutanota brings secure email for everybody.
Element
Element is an All-in-one secure chat app for teams, friends and organisations that allow you to own your conversations. With Element you can keep conversations in your control, safe from data-mining and ads. Element utilize the open and global Matrix network for message relay, protected by proven end-to-end encryption.
Vivaldi
Vivaldi is a free web browser developed by the co-founder of Opera Software Jon Stephenson von Tetzchner and Tatsuki Tomita. The browser was first released in 2016, when it set out to rival other popular web browsers with a new take on UI and UX. Vivalid is a fast browser that gives you as a user ton of control over your browsing experience while at the same time respecting your privacy and security.
Popcorn Time
Popcorn Time is a free and open-source BitTorrent client and media platform. With Popcorn Time you can watch any movie or TV episode in full HD. The software is constantly searching all over the web just for the highest quality torrents from the most important sites. If the available torrent provides subtitles or dubbed version, Popcorn Time will detect it and make it available as a choice.
Brave
Brave is a free and open-source web browser that automatically blocks ads and website trackers. The brave browser is built with a strong focus on privacy and security for the end user. The browser also includes a cryptocurrency wallet that can be used to reward content creators and sites that the user visit with Basic Attention Tokens.
I2P
The Invisible Internet Project or I2P for short is a fully encrypted private network layer that has been developed with privacy and security by design in order to provide protection for your activity, location and your identity. I2P ships with a router that connects you to the network and applications for sharing, communicating and building a fully encrypted private network layer.
OpenVPN
OpenVPN is a free and open-source VPN client developed by OpenVPN Inc. The software can be used to create secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. OpenVPN uses custom security protocol that utilizes SSL/TLS for key exchange and is compatible with any OpenVPN protocol compatible server.
Habitica
Habitica is a free habit-building and productivity app that treats your real life like a game. The application can help you reach your goals and achieve better health, productivity and happiness. Habitica is built around a strong social network that will motivate you and inspire as you receive rewards and punishments based on performance of your tasks. Over 4 million people use Habitica to improve their life one task at a time.