Aloaha POP3 SDK   
http://www.aloaha.com

POP3 SDK allows you to be able to access a POP3 server with minimal knowledge of how POP3 works and very little code. There are many features for simplifying tasks of accessing an POP3 server. POP3 SDK allows you to: Be used in a scriptable language such as VBScript and ASP Find out how many messages are there without downloading anything Get Scan listings Get Full messages or just the headers Get the Unique Identifiers for messages Delete messages Use every command that POP3 protocol supports Plus added features for parsing headers of messages HTML, PlainText Body parsing Save attachments and messages to disk The Post Office Protocol v3 SDK allows for a great deal of control over your messages. You can download messages and quickly access the key features of them you want, like grabbing those file attachments or check them agains the Sender Policy Framework SPF before downloading or deleting them. This component makes it easy for you write a program that incorporates watching a mail drop for specific information, receive sent files and data, and much more. Visit our FAQ: news://news.aloaha.com

Popp   
http://www.thejackol.com

Popp is a small and quick POP3 client that will help you manage multiple POP3 accounts, access them quickly, preview messages and delete multiple messages. It includes Rijndael encryption for passwords that are stored with it, along with support for Proxy servers. A must for users with multiple email accounts.

Eclarsys PopGrabber   
http://www.eclarsys.com

Eclarsys PopGrabber is a simple program which retrieves Emails from POP3 accounts and forwards them to any SMTP Server. COMPLETELY FREE 3 ACCOUNT VERSION available for download! Works a a Windows service. Small .Net based program. Please note: Current version does not support SSL connections, SMTP authentication or catch-all mailboxes (each POP3 account is forwarded to a single SMTP account). These features are planned for the next release.

SmartPOP2Exchange   
http://www.jam-software.com

SmartPOP2Exchange helps you to connect your existing POP3 and IMAP accounts to an SMTP or Exchange mail server. SmartPOP2Exchange works in background and downloads all messages from various POP3/IMAP accounts and forwards them to your SMTP/Exchange server. It also supports downloading of RSS Feeds and delivers them as mails to specified account. An easy to use configuration tool allows you to adjust common settings like download interval, timeout, log file etc. and to add, delete or configure your SMTP/Exchange and POP3/IMAP accounts. An additional Remote Control Software for SmartPOP2Exchange allows you to do all this from any other PC over network. A configurable spam filter allows to tag or delete mails, which have been identified as spam. The popular SpamAssassin software is used to identify the spam mails. SmartPOP2Exchange also supports a flexible and powerful set of rules which allow you to define additional actions for certain messages. Nearly all installed virus scanners can be used by SmartPOP2Exchange in order to identify mails infected by a virus or trojan.