Cryptocat is free software that aims to provide an open, accessible Instant Messaging environment that encrypts your conversations and works right in your browser. It uses the OTR protocol over XMPP for encrypted two-party chat and the (upcoming) mpOTR protocol for encrypted multi-party chat.

Cryptocat - Encrypted Chat

Off-the-Record (OTR) Messaging allows you to have private conversations over instant messaging by providing encryption, authentication, deniability, and perfect forward secrecy. If you lose control of your private keys, no previous conversation is compromised. 

Off-the-Record Messaging Provides Private Conversations Over IM

Standard Notes is the 100 year notes app. It's built long-lasting so you never have to find another one. It syncs on all your devices. It encrypts your data to protect your privacy. And it backs up your notes so you never lose anything again. 
 
Standard Notes comprises of two main technologies that work together to ensure a private, secure experience. One is the core stack of Standard Notes client applications. On the other end is a simple framework called Standard File used for encrypting data locally and syncing it to the cloud.

Standard Notes is the 100 year notes app. It's built long-lasting so you never have to find another one. It syncs on all your devices. It encrypts your data to protect your privacy. And it backs up your notes so you never lose anything again. 

Standard Notes - Your notes for good

LibreCaptcha is a framework that allows developers to create their own CAPTCHAs. The framework defines the API for a CAPTCHA generator. It provides an HTTP interface for serving CAPTCHAs, Background workers to pre-compute CAPTCHAs and to store them in a database, Managing secrets for the CAPTCHAs (tokens, expected answers, etc), Safe re-impressions of CAPTCHA images (by creating unique tokens for every impression) and lot more.

LibreCaptcha - Framework that allows developers to create their own CAPTCHAs

The world's most private and secure chat - open-source, decentralized, and without global identities of any kind. You can use it from the terminal UI, with all contacts and groups in one window. It is a federated chat system with end to end encryption support and low risk of man in the middle attack. 
 
It solves privacy problem by making both messages and contacts accessible only on client devices, reducing the role of the servers to simple message brokers that only require authorization of messages sent to the queues, but do NOT require user authentication.
 
Simplex messaging protocol (SMP) for messaging via secure persistent queues will serve as the low level protocol for SimpleX chat. It uses different encryption keys for each message queue - the key is passed via existing secure channel - e.g. QR code or another simplex queue.

The world's most private and secure chat - open-source, decentralized, and without global identities of any kind. You can use it from the terminal UI, with all contacts and groups in one window. It is a federated chat system with end to end encryption support and low risk of man in the middle attack. 

SimpleX Chat - Decentralized chat with a focus on users’ privacy

CrypTag is an idea, a spec, an API, and a piece of software that makes it easy to build a zero-knowledge system, which means that the server holding user data doesn't know what it is (since it's encrypted).
 
It is meant as a primitive to be used to build more sophisticated systems that would rather not re-implement the pieces necessary to build a zero-knowledge system, but several useful command line applications have been built with it so far, namely cput (for encrypting/saving files), cget (for fetching/decrypting files), and cpass (CryptPass, a password manager).

CrypTag is an idea, a spec, an API, and a piece of software that makes it easy to build a zero-knowledge system, which means that the server holding user data doesn't know what it is (since it's encrypted).

Cryptag - Encrypted, taggable, searchable cloud storage

gngr is an independent implementation of web standards in pure Java. It is not a wrapper around other browser engines. gngr plans to protect privacy by disabling Cookies, Javascript, XHR requests and providing fine granuality of control over them. 

gngr - A cross-platform browser focussed on privacy

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Cryptocat - Encrypted Chat

Off-the-Record Messaging Provides Private Conversations Over IM

Standard Notes - Your notes for good

LibreCaptcha - Framework that allows developers to create their own CAPTCHAs

SimpleX Chat - Decentralized chat with a focus on users’ privacy

Cryptag - Encrypted, taggable, searchable cloud storage

gngr - A cross-platform browser focussed on privacy

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Cryptocat - Encrypted Chat

Off-the-Record Messaging Provides Private Conversations Over IM

Standard Notes - Your notes for good

LibreCaptcha - Framework that allows developers to create their own CAPTCHAs

SimpleX Chat - Decentralized chat with a focus on users’ privacy

Cryptag - Encrypted, taggable, searchable cloud storage

gngr - A cross-platform browser focussed on privacy

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