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apps
cryptography
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2007 establishments in california
assistive technology
california
companies based in san francisco
computing input devices
cryptographic software
encryption
end-to-end encryption
free and open-source android software
free instant messaging clients
free security software
free software programmed in java (programming language)
free voip software
groupware
health informatics
instant messaging clients programmed in java
internet privacy software
ios software
messaging
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mobile software
secure communication
signal
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social
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software companies based in california
startups
technology in society
videotelephony
voice messaging
voxer
walkie-talkies
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encrypted
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open
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