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Signal's software is free and open-source. Its mobile clients, desktop client, and server are all published under the AGPL-3.0-only license. [ a ] [ b ] [ 11 ] [ 10 ] [ 12 ] [ 13 ] The official Android app generally uses the proprietary Google Play Services , although it is designed to be able to work without them.
The Polychrony toolset is an open-source development environment for critical/embedded systems based on SIGNAL, a real-time polychronous dataflow language. It provides a unified model-driven environment to perform design exploration by using top-down and bottom-up design methodologies formally supported by design model transformations from specification to implementation and from synchrony to ...
Open Whisper Systems (abbreviated OWS [7]) was a software development group [8] that was founded by Moxie Marlinspike in 2013. The group picked up the open source development of TextSecure and RedPhone, and was later responsible for starting the development of the Signal Protocol [9] and the Signal messaging app.
Signal Messenger LLC was founded simultaneously with the Signal Technology Foundation and operates as its subsidiary. It is responsible for the development of the Signal messaging app [16] and the Signal Protocol. Moxie Marlinspike served as Signal Messenger's first CEO [14] until stepping down on January 10, 2022. [17]
In September 2015, G Data Software launched a new messaging app called Secure Chat which used the Signal Protocol. [34] [35] G Data discontinued the service in May 2018. [36] In September 2016, Google launched a new messaging app called Allo, which featured an optional Incognito Mode that used the Signal Protocol for end-to-end encryption.
[2] [3] [4] Some of the company's software products were released under open-source licenses after the acquisition. [5] An independent group called Open Whisper Systems later picked up the development of this open-source software, [6] which led to the creation of the Signal Technology Foundation. [7] [8]
GNU Radio is a free software development toolkit that provides signal processing blocks to implement software-defined radios and signal processing systems. It can be used with external radio frequency (RF) hardware to create software-defined radios, or without hardware in a simulation-like environment. It is widely used in hobbyist, academic ...
SIGNAL (programming language), a synchronous programming language; Signal (software), an end-to-end encrypted voice calling, video calling and instant messaging application Signal Protocol, a cryptographic protocol used by the Signal application; Signal (IPC), a form of inter-process communication used in Unix and related operating systems