High Speed Verifier   
http://www.mailutilities.com

High Speed Verifier (HSV) is a high-speed software designed to check e-mail address for existence. HSV is capable of checking thousands of addresses per second. It can easily deal with mailing lists containing tens millions of addresses; moreover, it is with this list size that the program's highest performance can be achieved. HSV detects about 20-30% of invalid addresses in a mailing list, though theoretically it is possible to detect up to 60-70% using a software product. This figure seems relatively small, but actually it might make 10% of a list. Besides, HSV provides for optimal checking mode in terms of time and data traffic. More thorough checking (with which the rest 40% of dead emails could be detected) takes 10 times longer and requires 5 times greater traffic for each address, hence it's not that advisable with huge lists.

Mailbox Verifier   
http://www.mailutilities.com

Mailbox Verifier (MV) is a small free software that will notify you about new messages arrived to your mailbox. The number of mailboxes MV can check is unlimited; it works with the POP3 protocol and can't deal with web-interface mailboxes and IMAP-servers. Besides, MV is very flexible and easy to configure. MV is familiar with many popular mail clients and never conflicts with them. You can check for new messages either manually or automatically with any time interval chosen. New message alert can be combined from blinking program icon in tray, sound alert and/or pop-up window as you like. MV is tactful enough to disable window pop-up while screen saver is running, and can hold back from attempting to check mail when there is no Internet connection.

Email Address Juggler   
http://www.mirage-avm.com

Email Address Juggler is a great program for sorting-out large numbers of email addresses. It's perfect for keeping your friends, customers or club members up to date. It has plenty of time-saving tools for loading, splitting and merging lists. If somebody decides they want out from a list, add them to the removals list to make sure that you don't bother them again. When you've got your list ready, use the built-in international spell-checker to check your message and then send it out with a click of the mouse. IMPORTANT: This is not spamming software. Juggler must never be used for sending offensive messages or unsolicited promotional material. The program contains features to help combat spammers!

Li'l MailChecker   
http://software.neuhaus13.com

With this program you can easily check your mailbox for special mails, e.g. from a friend, from your boss, favorite mailing partner or whoever. If such a mail comes in you will be notified about this by playing a sound and showing the mail. The advantage is that Li'L MailChecker is small and can run in background so it is not neccessary to run a big and resource wasting email-client (like Outlook) all the time.

QVCS   
http://www.qumasoft.com

QVCS is an affordable version control system for the Windows developer. It matches more expensive products in features that are useful to small development teams, and is easy to use and administer. See at a glance which files are checked out, which files have changed since check out, who most recently changed a file, etc. Directory recursion allows you to see this for a single directory, or for an entire project. Perform common operations like check in or check out with the click of a button. QVCS supports both text and binary files.QVCS has extensive on-line help, and two separate tutorials to introduce a new user to the product. The QVCS GUI tool (called QWin) displays the revision history of the files in a project and allows the user to sort the revision history by a number of criteria, including file status, checkin date, filename, locker, etc. QWin can filter the revision history to show only those revisions that pass the filter criteria. It can print reports for the current list of revisions. QWin allows the user to sort and filter the list of files that it displays. File filtering allows the user to limit the set of files that QWin will display and perform a operations on. Files can be filtered by file extension, label, most recent revision date, etc. QWin supports file and project level operations, so you can check out a single file, or check out all the files in a project with a few mouse clicks. QWin has support for 'file groups' so you can perform the same operation on a group of files by selecting just one of the files in the file group. This is especially useful for Delphi and Visual Basic users.