Bacula is a set of computer programs that permits the system administrator to manage backup, recovery, and verification of computer data across a network of computers of different kinds. Bacula can also run entirely upon a single computer and can backup to various types of media, including tape and disk.

In technical terms, it is a network Client/Server based backup program. Bacula is relatively easy to use and efficient, while offering many advanced storage management features that make it easy to find and recover lost or damaged files. Due to its modular design, Bacula is scalable from small single computer systems to systems consisting of hundreds of computers located over a large network.

Redically simple, intelligent and robust backup & recovery for MySQL

Percona XtraBackup is the world’s only open-source, free MySQL hot backup software that performs non-blocking backups for InnoDB and XtraDB databases. With Percona XtraBackup, you can achieve the following benefits:

Backups that complete quickly and reliably
Uninterrupted transaction processing during backups
Savings on disk space and network bandwidth
Automatic backup verification
Higher uptime due to faster restore time

Percona XtraBackup makes MySQL hot backups for all versions of Percona Server, MySQL, and MariaDB. It performs streaming, compressed, and incremental MySQL backups.

Percona XtraBackup works with MySQL, MariaDB, and Percona Server. It supports completely non-blocking backups of InnoDB, XtraDB, and HailDB storage engines. In addition, it can back up the following storage engines by briefly pausing writes at the end of the backup: MyISAM, Merge, and Archive, including partitioned tables, triggers, and database options.

Percona’s enterprise-grade commercial MySQL Support contracts include support for Percona XtraBackup. We recommend support for critical production deployments.

Percona XtraBackup is an high performance, low-profile and non-blocking open-source backup utility for InnoDB and XtraDB databases.

Currently is the only open-source tool that performs backups on 'MySQL-based' servers (MySQL, MariaDB, Percona Server) that doesn't lock your database during it. Backups are online, and queries and transactions continue to run without interruption ('hot backups').

It can back up data from InnoDB, XtraDB, and MyISAM tables on MySQL 5.0 and 5.1 servers, and it has many advanced features like partial, remote, compressed and incremental backups, multi-threaded file copying for performance and Point-in-time recovery.

WebRTC (where RTC stands for Real-Time Communications) is a technology that enables audio/video streaming and data sharing between browser clients (peers). As a set of standards, WebRTC provides any browser with the ability to share application data and perform teleconferencing peer to peer, without the need to install plug-ins or third-party software.

WebRTC components are accessed with JavaScript APIs: the Network Stream API, which represents an audio or video data stream, the PeerConnection API, which allows two or more users to communicate browser-to-browser, and the DataChannel API that enables communication of other types of data for real-time gaming, text chat, file transfer, and so forth.

PeerJS simplifies WebRTC peer-to-peer data, video, and audio calls.

PeerJS wraps the browser's WebRTC implementation to provide a complete, configurable, and easy-to-use peer-to-peer connection API. Equipped with nothing but an ID, a peer can create a P2P data or media stream connection to a remote peer.

WebTorrent is the first torrent client that works in the browser. It's easy to get started!

What is it?

ShareDrop is a free app that allows you to easily and securely share files directly between devices without having to upload them to any server first.
How to use it?
Sharing files between devices in local network*

To send a file to another device in the same local network, open this page (i.e. www.sharedrop.io) on both devices. Drag and drop a file directly on other person's avatar or click the avatar and select the file you want to send. The file transfer will start once the recipient accepts the file.
Sharing files between devices in different networks

To send a file to another device in a different network, click + button in the upper right corner of the page and follow futher instructions.
Signing in

Additionally, you can sign in using Persona to allow others to easily recognize you. This will show others your email address and also your Gravatar, if you have one.

Free peer-to-peer file transfers in your browser.

We never store anything. Files only served fresh.

WebRTC is a free, open project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs. The WebRTC components have been optimized to best serve this purpose.

Our mission: To enable rich, high-quality RTC applications to be developed for the browser, mobile platforms, and IoT devices, and allow them all to communicate via a common set of protocols.

The WebRTC initiative is a project supported by Google, Mozilla and Opera, amongst others. This page is maintained by the Google Chrome team.

A blog

Download/upload files using the WebTorrent protocol (BitTorrent over WebRTC).

Free open source peer-to-peer
high-performance distributed datastore.

The world's global filesystem.

Matrix is an open standard for decentralised communication, providing simple HTTP APIs and open source reference implementations for securely distributing and persisting JSON over an open federation of servers.

There has been a guide to Tor hidden services for a long while now. It was about time for an I2P guide. For reference, here's the latest Tor Guide for Hidden Service (V. 4.0) http://pastebin.com/zRLGDRCM

The Invisible Internet Project (I2P) is an overlay network and darknet that allows applications to send messages to each other pseudonymously and securely. Uses include anonymous Web surfing, chatting, blogging and file transfers. The software that implements this layer is called an I2P router and a computer running I2P is called an I2P node.

The software is free and open source and is published under multiple licenses. The name I2P is derived from Invisible Internet Project, which, in pseudo-mathematical notation, is represented as I²P.

Ricochet is a different approach to instant messaging that doesn’t trust anyone in protecting your privacy.

- Eliminate metadata. Nobody knows who you are, who you talk to, or what you say.
- Stay anonymous. Share what you want, without sharing your identity and location.
- Nobody in the middle. There are no servers to monitor, censor, or hack.
Safe by default. Security isn’t secure until it’s automatic and easy to use.

$ usermod -a -G group user

If you don't use "-a" it will remove all the groups you belong before