ApexDC++ is free P2P software offering truly fast download speeds using the Direct Connect and ADC networks. It is also Open Source software published under GPL-2 allowing anybody to contribute.
ApexDC++ is free to download and provides the ability to achieve truly fast downloads.

Major Features
# Support for PeerGuardian binary list formats (P2Bv1, P2Bv2, P2Bv3 code taken from libp2p, with few minor modifications)
# PeerGuardian List Viewer
# Auto-open hubs OP Chat (works with the 1st entry of OP chat names list, which has been renamed to Hub Chatrooms)
# Toolbar positions are now saved
# Explorer like locking of toolbars (added a toolbar context menu, toolbar and media toolbar toggles aswell)
# Option to use AutoComplete in search window (this option also turns on persistent search history. AutoComplete from revconnect)
# Options to keep finished uploads/downloads between sessions
# Quick Search box (Under View menu)
# Added "Always on top" (Under View menu)
# Option to display full info for filelists in download queue
# Option to place all non-hub tabs in front (pm windows are counted as hub tabs)
# Option to use Zion like tabs
# Mini tabs (hub tabs only)
# Option to blend offline search results
# Option for logging chat in favorite hub properties
# Auto-resizing chat message boxes (set max value in experts only to 1 in order to disable this)
# Consider old clients (no full support for TTH) as cheating
# Option to use RegExp's and wildcards with ignorelist (use $Re: for RegExp, option to prevent it unnecessarily looking for them in the list)
# Option to toggle "speed indicators" of Stealthy styled progress bars
# Check finished files for viruses
# Ability to use the old way (StrongDC 1.x) of displaying hub names (default: disabled)
# Compatibility modes for few different kinds of external userlist images
# Files are highlighted in search window if user already has them shared (SMT)
# Chat command /reconnect (use /rc for short)
# RegExp ADLSearch and related features from Zion Blue 2.02
# Option to use one layout for all hub windows
# Modified the present "Hub chatrooms" feature so that it's more useful to those that use raws or user commands (see added note)
# Now extracts "metadata" from Profiles.xml file
# Back button to ClientProfileDlg
# The raw & cheating description quick access dialog from Zion Blue 2.02
# Delete checked filelists
# Extended Favourite download directories