KisMAC is an open-source and free stumbler/scanner application for Mac OS X. It has an advantage over MacStumbler/iStumbler/NetStumbler in that it uses monitor mode and passive scanning.
KisMAC supports several third party PCMCIA cards - Orinoco, PrismII, Cisco Aironet, Atheros and PrismGT. USB Prism2 is supported as well, and USB Ralink support is in development. All of the internal AirPort hardware is supported as well.
Please note: This program is not intended for novices but for professional users. Take this as your warning, you should be prepared for advanced topics and know what you are doing with your system.
Features:

• Reveals hidden/cloaked/closed SSIDs
• Shows logged in Clients (with MAC Addresses, IP addresses and signal strengths)
• Mapping and GPS support
• Can draw area maps of network coverage
• PCAP import and export
• Support for 802.11b/g
• Different attacks against encrypted networks
• Deauthentication attacks
• AppleScript-able
• Kismet drone support (capture from a Kismet drone)

Supported hardware chipsets:

• Apple AirPort and AirPort Extreme (dependent upon Apple’s drivers)
• Lucent Hermes I & II (Orinoco 2 and 11MBit)
• Intersil Prism 2, 2.5, 3 in PCMCIA and USB devices
• Cisco Aironet (with older 4.xx firmware)
• Intersil PrismGT
• Atheros PCMCIA
• Ralink rt2570 and rt73 USB devices (in development)

Crypto support:

• Bruteforce attacks against LEAP, WPA and WEP
• Weak scheduling attack against WEP
• Newsham 21-bit attack against WEP

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Visual NetTools is a set of network scanning, security, and administrator tools for Apple Mac useful in diagnosing networks and monitoring your computer’s network connections. Current version of Visual NetTools includes: Visual Ping Sends out an echo request to a specific computer on the network. It can be used to check communication links or to check whether the specific host exists or is running. Ping include not only text, but a complete Visual representation of echo requests from your comp. You can manage Ping interval and target host. History of network host included. We will add a lot of new tools shortly, some of new tools: TraceRoute: allow you to explore the Internet and troubleshoot connectivity problems. NetStat: displays a list of your computer’s inbound and outbound network connections, including the information on open TCP and UDP ports, IP address, and connection states. What makes it different from other NetStat utilities is the ability to map open ports to the owning application. Configurable alerts for incoming and outgoing connections are also available. PortScan: an advanced TCP port scanner that allows you to scan your network for active ports. And more useful tools for network monitoring and security.

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ReadAir is an OS X Themed Google Reader Desktop Client for Mac. Built with Adobe Air.

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Cocoa Packet Analyzer is a native Mac OS X implementation of a network protocol analyzer and packet sniffer. It uses libPCAP for reading packet trace files and for capturing network traffic. Supports the Cocoa bundles technology for creating TCP/IP application layer protocol “Analyzer PlugIns”.

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Viscosity is an OpenVPN client for Mac, providing a rich Cocoa graphical user interface for creating, editing, and controlling VPN connections. Viscosity provides a complete OpenVPN solution for Leopard (Mac OS 10.5) and does not require any additional downloads or software. Viscosity allows connections to be completely configured through a GUI, without any need to know how to use the command-line or OpenVPN’s configuration file syntax. Advanced users still have full manual control over configuration options if desired. As well as connection configuration, Viscosity also provides a global menu for quick connection/disconnection, as well as a details window containing connection information and traffic statistics. Features include: * Cocoa GUI * Designed for Leopard (Mac OS 10.5) * Keychain integration * Connection details (Client IP, Server IP, etc) * Traffic statistics * Multiple simultaneous connections * Growl integration

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Microsoft Remote Desktop Connection enables you to connect from your Macintosh computer to a Windows-based computer and work with programs and files on that computer. Mac users who have access to a Windows-based computer on a network, can use Remote Desktop Connection as an alternative to Microsoft Virtual PC for Mac.
To connect to a Windows-based computer, you need network access and permission to connect to the computer. In addition, the Windows-based computer must be running Terminal Services or Remote Desktop Services. The following Windows products support Remote Desktop connections:

• Windows XP Professional
• Windows Server 2003
• Windows 2000 Server
• Windows 2000 Advanced Server
• Windows 2000 Datacenter Server
• Windows NT Server 4.0, Terminal Server Edition

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JollysFastVNC is a VNC client which aims to become the best VNC client on the Mac. When I started ScreenRecycler I thought that there are enough VNC clients out there to support it. When the program started to get useful I realized that the VNC clients available on the Mac were pretty slow and people were complaining about the speed of ScreenRecycler. I was using VNCThing at the time which proved to be acceptable on PPC Macs but does not run on Intel Macs. Without a proper viewer people can’t access ScreenRecycler in a way I imagined. So I started programming JollysFastVNC to enable people using ScreenRecycler. As I got a few mails about the VNC capabilities of JollysFastVNC I decided to enhance the program to be a fully functional VNC client. It’s still in the early stages of development, even though somewhat usable and fast.

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iVPN is an application that makes use of the standards based PPTP VPN server installed with Mac OS X. This VPN server is usually only available on Mac OS X Server and configured through the Server Admin application. iVPN makes it possible to use the same server utility on the client version of Mac OS X.
All you have to do to set it up is to enter the user name and password that you want your VPN clients to use, the IP address range you want to give to your clients and then click start server. iVPN will handle all the other settings and start the VPN server.
iVPN is the GUI that Apple left out.
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JellyfiSSH is a simple bookmark manager for connecting to *NIX boxes like BSD, Linux, etc., via Telnet or SSH 1 or 2. You can set preferences for each bookmark including the terminal colours, window size, transparency and default login. Version 4 introduces Bookmark groups.

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Viscosity is a graphical user interface for OpenVPN, the excellent open-source VPN solution. Until now OpenVPN connections required familiarity with the command-line and Mac OS X’s Unix underpinnings to be able to use on a Mac. Viscosity changes this by providing a rich Cocoa user-interface for controlling OpenVPN connections.

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