Software
I've written and published the following programs to help fellow administrators. You may use the tools freely for any purpose, but please share your thoughts about them with me.
IntelligentUser (May 2006)
A Windows Live Messenger AddIn which tries to logically answer people with its primitive AI. You can have some good laughs if the party doesn't know they're talking to a computer. (Only in Hungarian.)

ExTools (Aug 2007)
A couple of message log viewing web applications for Exchange Server 2007. Installation, usage and other guides can be found in ExTools-install.pdf. (Only in Hungarian as of now.)

Alter Reply To Agent (Jan 2008)
An Exchange 2007 transport agent which modifies the Reply To header in messages sent to specific addresses. Very useful when creating mailing lists. A more detailed description is available in the ReadMe.txt file, which can be found in the downloadable ZIP.

Source
ClamAV Agent (Jun 2008)
A free virus scanner for Exchange 2007. It uses ClamAV as its scanning engine. Just download and install the Windows Installer package (.msi file).

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NetCalc (Sep 2008)
A network address calculator written for SmartPhone. It calculates the IP address class, the available number of hosts, the subnet mask in dotted decimal format, the network address and the address from an IP address and a subnet mask given in slash notation. The included converter can be used to convert from and to decimal, binary and hexadecimal. The .NET Compact Framework 1.0 is required. (Works with Windows Mobile 2003 SE for SmartPhone or later.)

Advanced Password Filter (Feb 2009)
The Advanced Password Filter is an open source password filter plug-in that extends the existing Windows password policy with configurable rules. For example, it can compare the newly set password against a dictionary, or check whether or not the new password resembles the previous one too much. When used in a domain environment, the filter needs to be installed on every domain controller. The password filter can be installed on workstations and member servers as well. Documentation can be found in the compressed packages. WARNING! YOU MUST ACCEPT THE ENCLOSED LICENSE AGREEMENT TO USE, DISTRIBUTE OR HANDLE THE PRODUCT IN ANY WAY!
Download
32 bit binary
64 bit binary
Source
License agreement
AD User Details (Mar 2009)
This tool displays different kinds of detailed information about Active Directory users, which are not displayed by regular tools, such as Active Directory Users and Computers. These details include the last logon time, logon count, last time the password has been set, etc.

Source
DSRM Password Sync (Sep 2009)
DSRM Password Sync is an application for synchronizing the Directory Services Restore Mode password of a Windows Server-based domain controller with the password of a given domain user. Documentation can be found in the compressed packages. WARNING! YOU MUST ACCEPT THE ENCLOSED LICENSE AGREEMENT TO USE, DISTRIBUTE OR HANDLE THE PRODUCT IN ANY WAY!
Download
32 bit binary
64 bit binary
Source
License agreement