Open Source Software for Android
Cake Browser
Cake Browser is a swipe-based mobile web browser developed for Android and iOS. With Cake Browser you can enjoy a faster, more private mobile browser that includes a free VPN service.
Magisk
Magisk is known as a "systemless" root method. It's essentially a way to modify the system without actually modifying it. Modifications are stored safely in the boot partition instead of on the main system. With Magisk you can root phone or tablet to give you complete control over the system with compromising your device.
Signal
Signal is a cross-platform encrypted messaging application that has a strong focus on privacy. The application is developed by Signal Messenger LLC and provides users with features like one-to-one and group messages, which can include files, voice notes, images and videos. The software is famous for being used by the whistleblower and privacy advocate Edward Snowden who once said "I use Signal every day, it is the most scalable encryption tool we have".
NewPipe
NewPipe is a free and open-source media player app that is most well-known as an unofficial YouTube client. The software is avalible to in the F-Droid software repository, a community-maintained software repository for Android. With NewPipe, you can view youtube videos without worrying about privacy concerns. As NewPipe only send information which are required to get video and channel details, and store everything else offline on your device.
WPS Office
WPS Office is a powerful office suite that offers tools for writing documents, managing speadsheets and creating presentations. WPS Office features built-in spell check, keyboard shortcuts, view multiple documents, password protection, save to .pdf, convert to .doc .docx, mail merge, and an intuetive interface that makes you feel right at home. Included in the WPS Office suite is WPS Writer, WPS Spreadsheet, and WPSPresentation.
Airsite
With Airsite you can create landing pages for yourself or your business, on your mobile phone. Airsite can be used on your Android or iOS devices and allow your to build your next page without any programming or web design skills.
andOTP
andOTP implements time-based one-time passwords (TOTP) and HMAC-based one-time passwords (HOTP). With andOTP you can simply scan the QR code and login with the generated 6-digit code. Allowing you to more easily and securely access your online accounts.
Packet Sender
Packet Sender is a free and open source utility to allow sending and receiving network packets, with support for TCP, UDP, and SSL. The tool is designed to be while still providing enough features for power users to do what they need, allowing anyone to manage packets according to their needs. Packet Sender is most commonly used for testing network APIs, malware analysis, testing network connectivity/firewalls and security research.
Flyway
Flyway provides open source, enterpise-grade version control for your database. By allowing your application to have a robust schema evulotion across all your environments, you can restasured that your applications are built safer and faster. With Flyway you can manage your database with plain old SQL and perform migrations for advanced data transformations and handling with LOBs and drop all tables, views, triggers, and more from a schema without dropping the schema itself. Flyway also integraties with cloud database provides and third-party hosting platforms such as Amazon RDS, Microsoft SQL Azure, Google Cloud SQL, Heroku, and more.
Cryptomator
Cryptomator is a simple tool makes your cloud storage trustworthy. With Cryptomator, you can encrypt your data quickly and save it to your favorite cloud services provider. The tool is released as free and open source software under the MIT License. Allowing you and other developers to verify and build upon the source code, to further strengthen and improve the application.