This is intended to be a comprehensive listing of applications used with I2P. If you know of something that's missing please submit a ticket on Trac, and be sure to select the “www” component in the submission form.

Supported applications are tagged with one or more of the following:

bundled

Bundled application — I2P ships with a few officially supported applications that let new users take immediate advantage of some of I2P's more useful capabilities.

plugin

Third-party plugin — I2P's plugin system provides convenient deployment of I2P-enabled applications and allows tighter integration with the router. Plugins are [reviewed by the community](http://plugins.i2p.xyz) to identify security and anonymity issues.

standalone, standalone/mod

Third-party standalone application — Many standard network applications only require careful setup and configuration to communicate anonymously over I2P. These are tagged with standalone. Some applications, tagged with standalone/mod, require patching to function properly over I2P or to prevent inadvertent disclosure of identifying information such as the user's hostname or external IP address.

service

Third-party essential network service — Services which on the I2P network are analogous to those provided on the public Internet by hosting providers, ISPs, and Google: eepsite indexes and jump services, search engines, email, DNS-style name services, hosting, proxies, etc. These services focus on boosting the usefulness of the network as a whole, and making network content more discoverable.

unmaintained

Unmaintained — This is used to tag plugins, applications, and services which appear to be unmaintained and may be removed from this listing in the future.

Warning: Using an application, plugin, or service with I2P doesn't automatically protect your anonymity. I2P is merely a set of tools which can help you mitigate certain identified threats to anonymity. We do not and cannot make any guarantees about the safety of the applications, plugins, and services listed below. Most applications and plugins must be properly configured, and some will need to be patched — and even then your anonymity might not be assured. Similarly, services could put your anonymity at risk, either by design or through carelessness on their part or your own.

If you have doubts about the suitability of an application, plugin, or service for use with I2P, you are urged to inquire about privacy issues with its maintainers, to search its mailing lists and bug tracker if one exists, and consult trusted, knowledgeable members of the I2P community.

Take responsibility for your own anonymity and safety — always seek expert advice, educate yourself, practice good judgment, be mindful of disclosing personally identifying information, and don't take shortcuts.

Blogging, Forums, and Wikis

  • El Dorado — Lightweight forum software. [standalone/mod]

  • Pebble — Another lightweight blogging platform. [plugin, standalone/mod]

  • phpBB — Most popular open source forum software. [standalone/mod]

  • Syndie — Distributed forums software, originally developed by jrandom. [plugin, standalone, unmaintained]

  • JAMWiki — A Java-based MediaWiki clone. No external database needed. Plugin available here. [standalone, plugin]

Decentralized File Storage

Development Tools

Version control

  • Git — Most popular distributed version control system. [standalone]

  • Monotone — Another distributed version control system. Currently used in I2P development. [standalone]

Domain Naming

  • susidns — Provides management of addressbooks, which are part of a simple, user-controlled I2P naming system somewhat analogous to the Internet's Domain Name System (DNS). Addressbooks map Base64 destinations to short, usually human-readable “domain” names ending with a .i2p suffix which the I2P router's HTTP client can resolve back to Base64 addresses. (Note: While Base64 destinations are globally unique, addressbook “domain” names only resolve to unique destinations locally.) [bundled]

Email

  • I2P-Bote — Serverless peer-to-peer email application using a distributed hash table (DHT) for secure mail storage. [plugin]

  • Postman's anonymous email service — Provides email service within the I2P network via @mail.i2p addresses, and email gateway service between the I2P network and the public Internet via @i2pmail.org addresses. One of the oldest continuous services on I2P. [service]

  • susimail — Simple web browser-based email interface. Configured to use Postman's email service by default. [bundled]

  • Sylpheed Claws, Thunderbird, other MUAs — Can be configured to use Postman's email service. See this comparison of MUAs, and configuration settings for SMTP and POP3. [standalone]

File Sharing

BitTorrent clients

  • I2PSnark — I2P's integrated BitTorrent client. [bundled]

  • I2PSnarkXL — Modified version of I2PSnark. [standalone]

  • Robert — A fork of rufus that uses the Basic Open Bridge (BOB) and has many improvements, including using the latest wxwidgets and python. It also supports use of seedless if installed for trackerless torrents and magnet-link like fetching of torrents within I2P. [standalone]

  • Transmission — Clean, full-featured cross-platform BitTorrent client with official ports for several GUI toolkits. [standalone/mod]

  • Azureus/Vuze — Has a plugin providing I2P support. [standalone, unmaintained]

BitTorrent trackers and indexers

For a detailed feature comparison of I2P-enabled trackers/indexers, see here.

  • Bytemonsoon — The code that powered one of the first major tracker/indexer sites on the Internet. Patched for I2P. [standalone/mod]

  • opentracker — Lightweight tracker/indexer. I2P mod available in the i2p.opentracker branch of the I2P Monotone repository. [standalone/mod]

  • zzzot — zzz's Java-based open tracker. More info here. [plugin]

ED2K

  • iMule — I2P port of the aMule ED2K client. [standalone]

Gnutella

  • I2Phex — Port of the Phex Gnutella client. Website for plugin version here. [plugin, standalone]

  • jwebcache — Cache for Gnutella peers on I2P. Website for plugin version here. [plugin, standalone]

Network Administration

General-purpose socket utilities

  • netcat — Unix standard tool for socket relaying. Several clones, ports, and forks have appeared over the years. [standalone]

  • socat — Like netcat but more powerful. [standalone]

  • tsocks — Proxy providing simple, transparent SOCKS-ification of network applications. [standalone]

SSH/SCP/SFTP

  • OpenSSH — Most popular implementation of the Secure Shell (SSH) protocol and related tools. [standalone]

  • PuTTY — Open source Secure Shell (SSH) client for Windows. [standalone]

Real-time Chat

Instant messaging clients

  • I2P Messenger — IM client with multiple incarnations. [standalone]

IRC clients

Many IRC clients leak identifying information to servers or other clients, so I2P's IRC and SOCKS IRC client tunnels filter certain inbound and outbound messages to scrub data such as LAN IP addresses, external IP addresses, local hostnames, and the name and version of the IRC client. Two message types in particular, DCC and CTCP, can't be sufficiently anonymized without changes to the protocols or to IRC client/server code, so they are completely blocked, except for CTCP ACTION (the message emitted by the /me command) which isn't inherently dangerous.

I2P's IRC filtering may not cover every possible leak — users should also check if their client is sending their real name or local username. Packet sniffers such as Wireshark are useful here. Eliminating remaining leaks may be as simple as changing the client's default configuration. If that doesn't help, inform the I2P developers; they may be able to solve it via additional filtering.

  • jIRCii — Small Java-based IRC client. Plugin available here. [plugin, standalone]

  • XChat — Cross-platform graphical IRC client. [standalone]

  • irssi — Unixy terminal-based IRC client. [standalone]

  • WeeChat — Another Unixy terminal-based IRC client. [standalone]

IRC servers

  • ngIRCd — IRC server developed from scratch. [standalone/mod]

  • UnrealIRCd — Most popular IRC server. [standalone/mod]

Web Browsing

Anonymous websites

  • Eepsites — Any website hosted anonymously on I2P, reachable through the I2P router's HTTP proxy. [service]

  • Deepsites — Distributed anonymous websites hosted using Tahoe-LAFS-I2P, currently only reachable with Tahoe-LAFS-I2P clients or through the Tahoe-LAFS-I2P HTTP proxy. [service]

  • i2host.i2p.xyz — Website for sponge's jump service. Source code available. [service]

  • i2jump.i2p.xyz — Another jump service. [service]

  • identiguy.i2p.xyz — Dynamically updated eepsite index. [service]

  • stats.i2p — Website for zzz's jump service. [service]

Proxy software

  • Polipo — SOCKS-enabled caching web proxy with basic filtering capabilities. [standalone]

  • Privoxy — Privacy-focused non-caching web proxy with advanced filtering capabilities. Excels at removing ads and other junk. [standalone]

  • Squid — Venerable caching web proxy. [standalone]

Inproxies

Gateways allowing users on the public Internet to access eepsites.

  • i2p.to — tino's inproxy on the public Internet. [service]
  • i2p.us — Another inproxy on the public Internet. [service]
  • i2p.me — Another inproxy on the public Internet. [service]

Outproxies

Gateways allowing I2P users to access content hosted on the public Internet.

  • false.i2p — Publicly advertised outproxy running Squid, located in Europe. [service]

Website Hosting

  • Jetty — Lightweight web server and Java servlet container. I2P is tightly integrated with a bundled copy of Jetty which by default is configured to host the user's eepsite. The bundled Jetty also serves the I2P router console and web applications bundled with I2P. [bundled, standalone]

Web servers

In addition to Jetty, any web server should function over I2P without modification so long as it's HTTP-compliant. Some web servers known to currently serve content on the I2P network are:

  • Apache HTTP Server — Most popular web server on the public WWW. [standalone]

  • Apache Tomcat — Web server and Java servlet container. More features than Jetty. [standalone]

  • lighttpd — Fast lightweight web server. [standalone]

  • nginx — High-performance lightweight web server. [standalone]