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Audacity: audio file modification

Audacity is free, open source software for recording and editing sounds. It is available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems.

TCP/IP network ports list

Looking for a tcp/ip ports list? Well, the web is very rich of documents concerning tcp ports, but this bookmark is easy and quick: http://www.grc.com/port_1.htm.

Some examples of the most common ones?
PORT 110
PORT 80
PORT 25
PORT 22
PORT 21

Free PDF creator

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To save documents as PDF (for FREE, of course!) you can alternatively use OpenOffice, that can save opened documents as PDF, or if you need an easier tool to print PDF from every program, this is what you are looking for: FreePDF.

As other PDF generation tools, it needs ghostscript: http://sourceforge.net/projects/ghostscript/.

Internet Time Servers - SNTP

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This is a sample list of Internet Time Servers using SNTP (Simple Time Network Protocol): time.nist.gov or time.windows.com aren't the only ones!

NAME, IP ADDRESS, LOCATION
time-a.nist.gov 129.6.15.28 NIST, Gaithersburg, Maryland
time-b.nist.gov 129.6.15.29 NIST, Gaithersburg, Maryland
time-a.timefreq.bldrdoc.gov 132.163.4.101 NIST, Boulder, Colorado
time-b.timefreq.bldrdoc.gov 132.163.4.102 NIST, Boulder, Colorado
time-c.timefreq.bldrdoc.gov 132.163.4.103 NIST, Boulder, Colorado
utcnist.colorado.edu 128.138.140.44 University of Colorado, Boulder

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