PRISM Break is a free, open source security and privacy application designed to help protect users from the PRISM surveillance program run by the US government. It provides tools to help users protect their data and communications from government surveillance, such as secure communications, data encryption, and secure storage of sensitive data. It also provides users with a detailed list of recommended privacy-enhancing tools and resources, as well as information on protecting their digital rights. Additionally, it provides practical advice on how to protect oneself from government surveillance and other security threats.
Privacytools.io is a website that offers extensive tips for improving online privacy and security, with a focus on using open source software and services that promote encryption. It's worth a look. If you use Firefox, follow their advice to make some neat privacy tweaks. Privacytools is updated regularly.