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former QueSO home page <URL:http://www.apostols.org/projectz/queso/>: How we can determine the remote OS using simple TCP packets? Well, it's easy, they're packets that don't make any sense, so the RFCs don't clearly state what to answer in these kind of situations. Facing this ambiguous, each TCP/IP stack takes a different approach to the problem, and this way, we get a different response. In some cases (like Linux, to name one) some programming mistakes make the OS detectable. QueSO sends: 0 SYN * THIS IS VALID, used to verify LISTEN 1 SYN+ACK 2 FIN 3 FIN+ACK 4 SYN+FIN 5 PSH 6 SYN+XXX+YYY * XXX & YYY are unused TCP flags All packets have a random seq_num and a 0x0 ack_num.

QuiteRSS is a open-source cross-platform RSS/Atom news feeds reader.

Radiator is a highly configurable and flexible Radius server that supports authentication by a huge range of authentication methods such as Flat files, DBM files, Unix password files, SQL databases, remote Radius servers (proxying), external programs, NT User Manager, Active Directory, LDAP, PAM, iPASS, GRIC, NIS+, Tacacs+, a wide range of ISP billing packages such as Emerald, Platypus, Rodopi, Hawk-i, Interbiller98, Freeside etc, your legacy user database etc, etc. Radiator now supports more 802.1x secure wireless and LAN authentication methods than any other Radius server giving a wide choice of 802.1x network clients. Radiator also includes many features not found in other Radius servers such as double-login prevention, username rewriting, full vendor-specific attributes, time-of-day blocking and a GUI for running user tests. Full list of technical features. Runs on all Unix, Linux, Windows 95, 98, NT, 2000, Mac OS-9 and Mac OS-X, VMS. Due to license restrictions, this package must be purchased and manually downloaded from the Open System Consultants web site.

This is the Cistron RADIUS daemon. Radiusd is a daemon that handles remote authentication requests and accounting for RADIUS clients. The clients may be terminal servers, Network Access Servers or other RADIUS servers.

Radreport is a perl script for parsing radius logs. While distributed by Lucent RABU, it is contributed software. Radreport has no active maintainer and is truly open source software: if you need an extra feature, hack it in yourself.

radvd implements IPv6 router advertisements for Linux and FreeBSD as specified in RFC 2461. Support for Mobile IPv6 as well as 6to4 is included.

Raggle is a console RSS aggregator, written in Ruby. Features include customizable keybindings, basic HTML rendering, HTTP proxy support, OPML import/export, themes, support for various versions of RSS, Screen support, browser auto-detection, and more. Raggle has been tested under Linux and OpenBSD, and should work properly under other Unix variants as well.

rdapper is a command-line client for the Registration Data Access Protocol (RDAP), as described in the RDAP RFCs (7480 - 7485). This tool will send an RDAP query to an RDAP server over HTTP or HTTPS, parse the JSON response, and display it in human-readable form.

Rdesktop is an open source client for Windows NT/2000/2003 Terminal Server, capable of natively speaking its Remote Desktop Protocol (RDP) in order to present the user's Windows desktop. Unlike Citrix ICA, no server extensions are required.

Recvnet is the inverse of telnet. Instead of connecting to some host, it listens on a port for incoming connections. When a connection is made, you can type a response which will be sent to the client. This tool has proven to be very useful while debugging Web browsers, httping, and others.