ThreemaProtocol on GitHub. [2021-04-12]. (原始内容存档于2020-09-20). Happich, Julien. Privacy gains traction with secure messaging apps. Electronic Engineering Times
Session(原始内容存档于2023-01-18) (英语). Session & Lokinet - Oxen | Privacy made simple.. Oxen. [2023-01-10]. (原始内容存档于2023-01-13) (英语). Privacy Policy - Session Private Messenger. Session
Searx[2019-07-15]. (原始内容存档于2020-11-11). Searx - Apps on Google Play . play .google.com. Tauber, Adam. searx: Privacy -respecting metasearch engine. 2017-08-30 [2017-08-31]
MicroG自由软件主题 microG是Google专有库的自由和开源实现,由德国开发者Marvin Wißfeld维护。移动设备用户可通过它使用Google Play 服務,而不受Google的跟踪(英语:Web tracking)。在一次演讲中,Wißfeld将microG描述为 "构建无Google专有组件的客製化Android的框架"。
TextSecure March 2014]. (原始内容存档于2015-12-25). Moxie Marlinspike. The New TextSecure: Privacy Beyond SMS. Open Whisper Systems. 24 February 2014 [26 February 2014].