| 3proxy | | Multi-protocol proxy |
| 6tunnel | | Tunnelling for applications that don't speak IPv6 |
| ada-polyorb | | Polymorphic, reusable infrastructure for building distributed systems |
| adns | | Asynchronous-capable DNS client library and utilities |
| aget | | Multithreaded HTTP download accelerator |
| aiccu | | Automatic IPv6 Connectivity Client Utility |
| amap (V) | | Applications and Services scanner |
| amazon-ecs-cli | | Amazon ECS Cli |
| amfora | | Terminal browser for the Gemini protocol |
| amule | | Another Emule P2P client |
| aoe-vblade | | ATA over Ethernet (AoE) server - thin, LAN-based storage protocol |
| ap-maxminddb | | MaxMind DB geolocalisation Apache Module |
| apollo | | Messaging broker built from the foundations of ActiveMQ |
| argus | | System and Network Monitoring Application |
| aria2 | | Multi-threaded, multi-protocol, flexible download accelerator |
| 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 |
| arti | | Implementation of tor in Rust |
| asterisk11-vicidial (V) | | The Asterisk Software PBX |
| asterisk16 (V) | | The Asterisk Software PBX |
| asterisk18 (V) | | The Asterisk Software PBX |
| asterisk19 (V) | | The Asterisk Software PBX |
| asterisk20 (V) | | The Asterisk Software PBX |
| asterisk21 (V) | | The Asterisk Software PBX |
| asterisk22 (V) | | The Asterisk Software PBX |
| asterisk23 (V) | | The Asterisk Software PBX |
| asuka | | Gemini Project client written in rust with ncurses |
| autonet | | Automatically configure network interface & WEP keys |
| avahi | | Facilitate service discovery on a local network |
| avahi-ui | | Facilitate service discovery on a local network (GUI) |
| awhois | | All-encompassing whois client wrapper |
| balance | | TCP loadbalancer with roundrobin and failover |
| bandcamp-dl | | Simple Python script to download Bandcamp albums |
| bandsnatch | | CLI batch downloader for your Bandcamp collection |
| baresip (V) | | SIP User-Agent with audio and video support |
| barnyard | | Fast output system for snort |
| batchftp | | Automatically download files via the FTP protocol |
| bbk_cli | | Bandwidth measurement tool for Nordic ISPs |
| beanstalkd | | Simple, fast work queue |
| bftpd | | Small and fast FTP server |
| bind918 | | Berkeley Internet Name Daemon implementation of DNS, version 9.18 |
| bird | | The BIRD Internet Routing Daemon |
| bmon | | Interface bandwidth monitor |
| bombadillo | | Gopher/Gemini client for the terminal |
| bounce | | Tool to forward TCP connection from one IP to another |
| bridge-utils (V) | | Ethernet bridging utilities for GNU/Linux |
| bridged | | Userland ethernet bridge daemon |
| bropages | | CLI to interact with bropages.org |
| bsddip | | Dialup IP program |
| btget | | Fast bittorrent client and library written in C |
| btpd | | Daemon for file sharing over bittorrent |
| bwm-ng | | Console-based bandwidth monitor |
| bwping | | Tool to measure bandwidth and RTT between two hosts using ICMP |
| cacti | | Web frontend to rrdtool for monitoring systems and services |
| cacti-spine | | Cacti poller for large installations |
| castor | | Client for plain-text protocols like Gemini, Gopher and Finger |
| cclive | | 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 |
| checkbot (V) | | Verify links on a set of HTML pages |
| 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 |
| coilmq | | Simple, lightweight, and easily extensible STOMP message broker |
| connect | | Open a TCP connection using a SOCKS4/5 or HTTP proxy server |
| corebird | | Native Gtk+ Twitter Client |
| corkscrew | | Tool for tunneling SSH through HTTP proxies |
| coturn | | TURN and STUN server (for VoIP/webrtc) |
| couriertcpd | | Courier TCP socket and TLS servers |
| coursera-dl | | Download course ressources for Coursera classes |
| cowpatty (V) | | Designed to audit the security of PSKs selected in WPA networks |
| cppzmq | | C++ binding for libzmq |
| croc | | Fast, simple, and secure file transfer between any two computers |
| cryptcat (V) | | Standard netcat enhanced with twofish encryption |
| csup | | Rewrite of the CVSup file updating client in C |
| czds | | Client to the CZDS REST API |
| czmq | | High-level C binding for ZeroMQ |
| dante | | BSD-licensed socks 4/5 proxy suite |
| daq | | Abstraction layer for libpcap |
| darkstat | | Network statistics gatherer |
| DarwinStreamingServer | | Open source version of Apple QuickTime Streaming Server |
| dbip-asn-lite | | DB-IP IP to ASN Lite: IPv4/v6 address to ASN |
| dbip-city-lite | | DB-IP IP to City Lite: IPv4/v6 address to city |
| dbip-country-lite | | DB-IP IP to Country Lite: IPv4/v6 address to country |
| ddclient | | Client to update dynamic DNS entries |
| ddns-route53 | | Dynamic DNS for Amazon Route 53 on a time-based schedule |