# I2P Javadocs for Release 0.8.7 Build 0

Core SDK (i2p.jar)
com.nettgryppa.security
freenet.support.CPUInformation
gnu.crypto.hash
gnu.crypto.prng
gnu.gettext
net.i2p: Core I2P package, contains information about the I2P version and an entry point to access important elements.
net.i2p.client: Implements the base I2P SDK for developing applications that communicate through I2P.
net.i2p.client.datagram: Provides a standard way for reading and writing messages transferred over I2P so that the recipient has an authenticated mechanism to reply to it.
net.i2p.client.naming: Provides a standard way for querying the local naming service to resolve a name into a `Destination` (without the complexity of JNDI).
net.i2p.crypto: These classes provide a number of low-level cryptographic routines.
net.i2p.data: These classes define the common data structures used by the various I2P protocols.
net.i2p.data.i2cp: The Invisible Internet Client Protocol (I2CP) allows applications simplified access to the I2P network without requiring them to deal with the issues involved with the Invisible Internet Network Protocol (I2NP).
net.i2p.desktopgui: Desktopgui is a graphical interface to I2P that allows managing the lifecycle of I2P from the system tray.
net.i2p.internal: Interface and classes for a router and client within the same JVM to directly pass I2CP messages using Queues instead of serialized messages over socket streams.
net.i2p.stat: These classes define the statistics package used extensively throughout the I2P router - both for adaptive operation of the router and for debugging.
net.i2p.time: Provides classes for time synchronisation using NTP.
net.i2p.util: These classes define the several useful utilities used throughout the router and applications.
net.metanotion.io
net.metanotion.io.block
net.metanotion.io.block.index
net.metanotion.io.data
net.metanotion.util.skiplist
org.bouncycastle.crypto
org.bouncycastle.crypto.digests
org.bouncycastle.crypto.macs
org.xlattice.crypto.filters

Streaming Library
net.i2p.client.streaming: Implements a TCP-like (reliable, authenticated, in order) set of sockets for communicating over the IP-like (unreliable, unauthenticated, unordered) I2P messages.

Router
net.i2p.data.i2np: The Invisible Internet Network Protocol (I2NP) is only a part of how an application can send messages over the network.
net.i2p.router: The I2P router application handles the I2P network communication.
net.i2p.router.client
net.i2p.router.message
net.i2p.router.networkdb
net.i2p.router.networkdb.kademlia
net.i2p.router.networkdb.reseed
net.i2p.router.peermanager: The peer manager logs information about the history and quality of network peers.
net.i2p.router.startup: The I2P startup package loads the configuration when I2P is started.
net.i2p.router.transport: The transport system allows the usage of communication layers that are below I2P in the stack, on which I2P messages are sent.
net.i2p.router.transport.ntcp: The NTCP transport allows passing I2P messages on top of TCP.
net.i2p.router.transport.udp: The UDP transport (also known as 'SSU transport') allows passing I2P messages on top of UDP.
net.i2p.router.tunnel
net.i2p.router.tunnel.pool
net.i2p.router.util: These classes define the several useful utilities used throughout the router.
org.cybergarage.http
org.cybergarage.net
org.cybergarage.soap
org.cybergarage.upnp
org.cybergarage.upnp.control
org.cybergarage.upnp.device
org.cybergarage.upnp.event
org.cybergarage.upnp.ssdp
org.cybergarage.upnp.xml
org.cybergarage.util
org.cybergarage.xml
org.cybergarage.xml.parser
org.freenetproject

Router Console
net.i2p.router.web

Addressbook Application
net.i2p.addressbook

BOB Bridge
net.i2p.BOB: BOB, the Basic Open Bridge, allows TCP applications to talk over I2P.

Desktopgui Application
net.i2p.desktopgui.gui
net.i2p.desktopgui.i18n
net.i2p.desktopgui.router
net.i2p.desktopgui.util

I2PSnark Application
org.klomp.snark
org.klomp.snark.bencode
org.klomp.snark.dht
org.klomp.snark.web

I2PTunnel Application
net.i2p.i2ptunnel
net.i2p.i2ptunnel.socks
net.i2p.i2ptunnel.streamr
net.i2p.i2ptunnel.udp
net.i2p.i2ptunnel.udpTunnel
net.i2p.i2ptunnel.web

SAM Bridge
net.i2p.sam
net.i2p.sam.client

SusiDNS Application
i2p.susi.dns

SusiMail Application
i2p.susi.debug
i2p.susi.util
i2p.susi.webmail
i2p.susi.webmail.encoding
i2p.susi.webmail.pop3
i2p.susi.webmail.smtp

Systray Application
net.i2p.apps.systray