| 3proxy | | Multi-protocol proxy |
| 6tunnel | | Tunnelling for applications that don't speak IPv6 |
| DarwinStreamingServer | | Open source version of Apple QuickTime Streaming Server |
| GeoIP | | Find the country from any IP address |
| Geomyidae | | Gopher daemon for Linux/BSD |
| IglooFTP | | Easy to use FTP client for X Window System |
| LaBrea | | Builds tarpits/honeypots for scanners |
| ORBit | | High-performance CORBA ORB with support for the C language |
| ORBit2 | | High-performance CORBA ORB with C language support |
| Radicale | | CalDAV (calendar) and CardDAV (contact) server |
| SDL_net | | Small sample cross-platform networking library for SDL |
| adns | | Asynchronous-capable DNS client library and utilities |
| aget | | Multithreaded HTTP download accelerator |
| aiccu | | Automatic IPv6 Connectivity Client Utility |
| airport2basestationconfig | | Configuration program for Apple's Airport Base Station |
| airportbasestationconfig | | Configuration program for Apple's Airport Base Station |
| airportmodemutility | | Modem (dis)connection utility for Apple's Airport Base Station |
| airsnort (V) | | WLAN sniffer and realtime WEP cracker |
| amap (V) | | Applications and Services scanner |
| amule | | Another Emule P2P client |
| aoe-vblade | | ATA over Ethernet (AoE) server - thin, LAN-based storage protocol |
| apollo | | Messaging broker built from the foundations of ActiveMQ |
| argus | | System and Network Monitoring Application |
| aria2 | | Multi-threaded, multi-protocol, flexible download accelerator |
| arla | | Free AFS implementation from KTH |
| arla-3.99.14 (V) | | Free AFS implementation from KTH |
| arp-scan | | Discovery and fingerprinting tool using ARP |
| arpd | | ARP daemon |
| arping | | ARP-level ping utility |
| arpwatch | | Monitor ARP activity on a network, maintaining a database |
| asterisk (V) | | The Asterisk Software PBX |
| asterisk10 (V) | | The Asterisk Software PBX |
| asterisk18 (V) | | The Asterisk Software PBX |
| autonet | | Automatically configure network interface & WEP keys |
| avahi | | Facilitate service discovery on a local network |
| awhois | | All-encompassing whois client wrapper |
| balance | | TCP loadbalancer with roundrobin and failover |
| barnyard | | Fast output system for snort |
| batchftp | | Automatically download files via the FTP protocol |
| bftpd | | Small and fast FTP server |
| bind96 | | Berkeley Internet Name Daemon implementation of DNS, version 9.6 |
| bind97 | | Berkeley Internet Name Daemon implementation of DNS, version 9.7 |
| bind98 | | Berkeley Internet Name Daemon implementation of DNS, version 9.8 |
| bind99 | | Berkeley Internet Name Daemon implementation of DNS, version 9.9 |
| bing | | Bing is a point-to-point bandwidth measurement tool |
| bird | | The BIRD Internet Routing Daemon |
| bird6 | | The BIRD Internet Routing Daemon |
| bittornado | | Experimental bittorrent client |
| bittornado-gui | | Experimental bittorrent client (wxGTK GUI) |
| bittorrent | | File sharing tool |
| bittorrent-gui | | File sharing tool (GTK+ GUI) |
| bmon | | Bmon is an interface bandwidth monitor |
| bounce | | Tool to forward TCP connection from one IP to another |
| bpalogin | | BigPond Advance login client |
| bridge-utils (V) | | Ethernet bridging utilities for GNU/Linux |
| bridged | | Userland ethernet bridge daemon |
| bsddip | | Dialup IP program |
| btget | | Fast bittorrent client and library written in C |
| btpd | | Daemon for file sharing over bittorrent |
| btscanner (V) | | Bluetooth device information viewer |
| bug-buddy | | Graphical GNOME2 bug reporting tool |
| bwping | | Tool to measure bandwidth and RTT between two hosts using ICMP |
| cacti | | Frontend to rrdtool for monitoring systems and services |
| calypso | | CardDAV/CalDAV server |
| cclive (V) | | Command line video extraction tool for user-uploaded video hosts |
| ccrtp | | RTP and RTSP protocol implementation using GNU CommonCpp |
| cdpd | | Simple daemon to send Cisco Discovery Protocol packets |
| cdpr (V) | | Cisco Discovery Protocol Reporter |
| cftp | | Comfortable FTP, a full screen ftp client |
| checkbot (V) | | Verify links on a set of HTML pages |
| chimera | | Distributed Hash Table implementation |
| chksniff | | Small tool to check for promiscuous interfaces |
| choparp | | Simple proxy arp daemon |
| choqok | | Twitter and StatusNet client for KDE |
| chrony | | Daemon for maintaining the accuracy of computer clocks |
| cia | | Simple IP accounting software |
| cidr | | RFC 1878 subnet calculator / helper |
| cisco-mibs | | Public SNMPv1 and SNMPv2 MIBs from Cisco |
| citrix_ica | | Citrix(R) ICA client for the Citrix(R) Presentation Server(TM) |
| clisp-rawsock | | CLISP rawsock module |
| clive | | Command line video extraction tool for user-uploaded video hosts |
| cmu-dhcpd | | CMU BootP and DHCP server, plus Princeton patches |
| cntlm | | NTLM/NTLMv2 authenticating HTTP proxy |
| coda | | Coda distributed fileystem |
| coherence | | Media server framework |
| coilmq | | Lightweight Python STOMP message broker |
| connect | | Open a TCP connection using a SOCKS4/5 or HTTP proxy server |
| corkscrew | | Tool for tunneling SSH through HTTP proxies |
| couriertcpd | | Courier TCP socket and TLS servers |
| cowpatty (V) | | Designed to audit the security of PSKs selected in WPA networks |
| cryptcat (V) | | Standard netcat enhanced with twofish encryption |
| csup | | Rewrite of the CVSup file updating client in C |
| cvsup (V) | | Daemon and client for cvsup |
| cvsup-gui (V) | | cvsup daemon and client |
| dante | | BSD-licensed socks 4/5 proxy suite |
| darkstat | | Network statistics gatherer |
| dc_gui2 | | Graphical user interface for DCTC |
| dcsharp | | File sharing client for the Direct Connect protocol |
| dctc | | Direct Connect clone (Direct Connect Text Client) |
| ddclient | | Client to update dynamic DNS entries |