These are my links for 23 dic 2011 through 28 dic 2011:

• E-MailRelay — SMTP proxy and store-and-forward MTA – E-MailRelay is a simple SMTP proxy and store-and-forward message transfer agent (MTA). When running as a proxy all e-mail messages can be passed through a user-defined program, such as a spam filter, which can drop, re-address or edit messages as they pass through. When running as a store-and-forward MTA incoming messages are stored in a local spool directory, and then forwarded to the next SMTP server on request.

  Because of its functional simplicity E-MailRelay is easy to configure, often only requiring the address of the target SMTP server to be put on the command line.

  E-MailRelay can also run as a POP3 server. Messages received over SMTP can be automatically dropped into several independent POP3 mailboxes.

  C++ source code is available for Linux, FreeBSD, MacOS X etc, and Windows. Distribution is under the GNU General Public License V3.

• IBM developerWorks : Training : Knowledge path : Overview – Knowledge paths are focused learning guides that bring together diverse training resources for IT professionals:
     How-to articles
     Free trial software
     Discussion forums
     Educational videos and podcasts
     Hands-on exercises
  These resources are specifically chosen by subject matter experts, and arranged in sequence to guide you from conceptual awareness to task mastery.
• Master Sheet Learn VI – The VI editor is a screen-based editor used by many Unix users. The VI editor has powerful features to aid programmers. If you master the use of Vim text editor, it can be a very powerful tool in your hands, and allow you to do amazing text editing feats with just a few taps on your keyboard.

  Many beginning users avoid using VI because the different features overwhelm them. To overcome it and practice it more you can use VI in bash. I have also collected some of the short cut keys which will be useful for you to learn VI

• XWiki – Open Source Wiki and Content-Oriented Application Platform (Main.WebHome) – XWiki.org – The XWiki project offers both a generic platform for developing collaborative applications using the wiki paradigm and products developed on top of it. All XWiki software is developed in Java and under the LGPL open source license.
  It's also a second generation wiki offering the ability to install and develop small applications inside wiki pages.
  Export wiki pages to PDF, ODT, RTF, XML or HTML. Easily turn Office documents (MS Office, Open Office, PDF, etc) into wiki pages.
  Use XWiki's RESTful and XML/RPC remote APIs to easily integrate XWiki with your application.
  Documents are stored in a relational database. Use your favorite database.
  Create applications by grouping several pages together. Import and export Applications to/from your wiki.
  various authentication mechanisms suported by XWiki (Form, Basic, LDAP, Custom, etc).
  Install/update/remove extensions in/from the wiki
  Allows creating XWiki macros through wiki pages