Cryptomator offers multi-platform transparent client-side encryption of your files in the cloud. Most cloud providers encrypt data only during transmission or they keep the keys for decryption for themselves. These keys can be stolen, copied, or misused. With Cryptomator, the key to your data is in your hands. Cryptomator encrypts your data quickly and easily. Afterwards you upload them protected to your favorite cloud service.
 
It works with Dropbox, Google Drive, OneDrive, MEGA, pCloud, ownCloud, Nextcloud and any other cloud storage service which synchronizes with a local directory. It uses AES encryption with 256-bit key length.

Cryptomator offers multi-platform transparent client-side encryption of your files in the cloud. Most cloud providers encrypt data only during transmission or they keep the keys for decryption for themselves. These keys can be stolen, copied, or misused. With Cryptomator, the key to your data is in your hands. Cryptomator encrypts your data quickly and easily. Afterwards you upload them protected to your favorite cloud service.



Cryptomator - Multi-platform transparent client-side encryption of your files in the cloud

With the rise of government surveillance programs, Tox, a FOSS initiative, aims to be an easy to use, all-in-one communication platform that ensures full privacy and secure message delivery. Tox must use UDP simply because hole punching with TCP is not as reliable. However, Tox does use TCP relays as a fallback if it encounters a firewall that prevents UDP hole punching.
 
It helps to chat instantly across the globe with Tox's secure messages. It supports Encrypted voice calls, Screen sharing, File sharing, Video calls, Share with group or team. Tox has no central servers that can be raided, shut down, or forced to turn over data — the network is made up of its users.

With the rise of government surveillance programs, Tox, a FOSS initiative, aims to be an easy to use, all-in-one communication platform that ensures full privacy and secure message delivery. Tox must use UDP simply because hole punching with TCP is not as reliable. However, Tox does use TCP relays as a fallback if it encounters a firewall that prevents UDP hole punching.

Tox - The future of online communications.

The Stanford Javascript Crypto Library is a project by the Stanford Computer Security Lab to build a secure, powerful, fast, small, easy-to-use, cross-browser library for cryptography in Javascript. SJCL is secure. It uses the industry-standard AES algorithm at 128, 192 or 256 bits; the SHA256 hash function; the HMAC authentication code; the PBKDF2 password strengthener; and the CCM and OCB authenticated-encryption modes.

sjcl - Stanford Javascript Crypto Library

OpenPGP.js is a JavaScript implementation of the OpenPGP protocol. It aims to provide an Open Source OpenPGP library in JavaScript so it can be used on virtually every device. This does not require gpg on their machines in order to use the library. The idea is to implement all the needed OpenPGP functionality in a JavaScript library that can be reused in other projects that provide browser extensions or server applications. It should allow you to sign, encrypt, decrypt, and verify any kind of text - in particular e-mails - as well as managing keys. 

OpenPGP.js - OpenPGP implementation for JavaScript

CCXT – CryptoCurrency eXchange Trading Library. A JavaScript / Python / PHP library for cryptocurrency trading and e-commerce with support for many bitcoin/ether/altcoin exchange markets and merchant APIs. The CCXT library is used to connect and trade with cryptocurrency / altcoin exchanges and payment processing services worldwide. It provides quick access to market data for storage, analysis, visualization, indicator development, algorithmic trading, strategy backtesting, bot programming, webshop integration and related software engineering.

CCXT - A JavaScript / Python / PHP cryptocurrency trading library with support for more than 100 bitcoin/altcoin exchanges

Celo is a mobile-first blockchain platform that makes financial dApps and crypto payments accessible to anyone with a mobile phone. Celo enables native and non-native digital assets–both cryptographic and Central Bank Digital Currencies (CBDCs)–to circulate freely across devices, carriers, and countries. This makes money mobile, global and accessible like never before. 
 
Celo’s Proof-of-Stake (PoS) consensus mechanism and automatic daily carbon offsets make Celo the world's first carbon-negative blockchain, offsetting over 2,285 tons of carbon to-date.

Celo is a mobile-first blockchain platform that makes financial dApps and crypto payments accessible to anyone with a mobile phone. Celo enables native and non-native digital assets–both cryptographic and Central Bank Digital Currencies (CBDCs)–to circulate freely across devices, carriers, and countries. This makes money mobile, global and accessible like never before. 

Celo - Crypto Made For Mobile

Download PolarSSL PolarSSL is an SSL library written in ANSI C. PolarSSL makes it easy for developers to include cryptographic and SSL/TLS capabilities in their (embedded) products with as little hassle as possible. It is designed to be readable, documented, tested, loosely coupled and portable. It supports Symmetric encryption algorithms, hash algorithms, RSA with PKCS and X.509 certificate, SSL and TLS.

PolarSSL library - Crypto and SSL made easy

CryptoJS is a growing collection of standard and secure cryptographic algorithms implemented in JavaScript using best practices and patterns. They are fast, and they have a consistent and simple interface.
CryptoJS supports MD5, SHA1, SHA256 algorithm for Hashing. It supports <span data-slate-fragment="JTdCJTIyb2JqZWN0JTIyJTNBJTIyZG9jdW1lbnQlMjIlMkMlMjJkYXRhJTIyJTNBJTdCJTdEJTJDJTIybm9kZXMlMjIlM0ElNUIlN0IlMjJvYmplY3QlMjIlM0ElMjJibG9jayUyMiUyQyUyMnR5cGUlMjIlM0ElMjJwYXJhZ3JhcGglMjIlMkMlMjJpc1ZvaWQlMjIlM0FmYWxzZSUyQyUyMmRhdGElMjIlM0ElN0IlN0QlMkMlMjJub2RlcyUyMiUzQSU1QiU3QiUyMm9iamVjdCUyMiUzQSUyMnRleHQlMjIlMkMlMjJsZWF2ZXMlMjIlM0ElNUIlN0IlMjJvYmplY3QlMjIlM0ElMjJsZWFmJTIyJTJDJTIydGV4dCUyMiUzQSUyMkFkdmFuY2VkJTIwRW5jcnlwdGlvbiUyMFN0YW5kYXJkJTIwKEFFUyklMjAlMjIlMkMlMjJtYXJrcyUyMiUzQSU1QiU1RCUyQyUyMnNlbGVjdGlvbnMlMjIlM0ElNUIlNUQlN0QlNUQlMkMlMjJrZXklMjIlM0ElMjJmZjk2NjgzYWZhNWU0OGUxOWVlOWNjOGMyY2EzMDM1OCUyMiU3RCU1RCUyQyUyMmtleSUyMiUzQSUyMmRhN2ZhMDlhZmUwZTQ0ZTc4ZDY5ZDYzMGU3ZTZmNGI4JTIyJTdEJTVEJTJDJTIya2V5JTIyJTNBJTIyYTUzMmViYTc1MmVmNDAyYmFkNDdhMDE3ZjE0ZGRjN2IlMjIlN0Q=">Advanced Encryption Standard (AES), DES, Triple DES, Rabbit, RC4, RC4Drop.
&nbsp;

Crypto-js -  JavaScript library of crypto standards

Charm is a framework for rapidly prototyping advanced cryptosystems.  Based on the Python language, it was designed from the ground up to minimize development time and code complexity while promoting the reuse of components. It supports Base crypto library, including symmetric encryption schemes, hash functions, PRNGs, digital signature, encryption and lot more.

Charm-crypto - A Python-based rapid prototyping framework for cryptosystems

Safe Pad is a simple text editor with a difference. When you save your document strong encryption is used to protect your file using triple AES256.

Safe Pad : Rich Text Editor with Strong Encryption for Total Security.

Botan (Japanese for peony) is a cryptography library written in C++11. Botan's goal is to be the best option for cryptography in new C++ code by offering the tools necessary to implement a range of practical systems, such as TLS/DTLS, PKIX certificate handling, PKCS#11 and TPM hardware support, password hashing, and post quantum crypto schemes. In addition to the C++, botan has a C89 API specifically designed to be easy to call from other languages. A Python binding using ctypes is included, and several other language bindings are available.

Botan - Crypto library for C++

Square stores a reserve of Bitcoins in an offline setting. By having these funds offline, it reduces attack surface and risk of theft. Square's solution is unique, specifically, it leverages FIPS certified Hardware Security Modules (HSMs) to protect the private key material. Funds can be sent from online systems to the cold storage at any time. Moving funds out of cold storage requires a multi-party signing ceremony.

SubZero - Square's Bitcoin Cold Storage solution

High-performance pure-javascript SHA1 implementation suitable for large binary data, reaching up to half the native speed.

Rusha - High-performance pure-javascript SHA1 implementation suitable for large binary data, reaching up to half the native speed.

Keygrip is a node.js module for signing and verifying data (such as cookies or URLs) through a rotating credential system, in which new server keys can be added and old ones removed regularly, without invalidating client credentials.

keygrip - Key signing and verification for rotated credentials 

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