Open source in sense means that the developer allows other developers to see some or all of their source code. Essentially what this means is that developers can develop add ons (free or paid) for a software or even better develop a similar software for users to have for free. Some examples of open source is Linux, Joomla, SugarCRM, Facebook and Twitter (opened up their API), 7 Zip, P Books, and ect.
Sourceforge.net is a great search tool in finding open sourced software that fits your needs.
The open source I want to talk about are the free ones. I have operated my companies with somewhere around 80% open sourced software.
Web Design
Joomla! (There are others, if you know another please reply with it)
Accounting
PBooks Open Source Accounting
PostBooks ERP, accounting, CRM by xTuple | Get PostBooks ERP, accounting, CRM by xTuple at SourceForge.net
PostgreSQL: News: PostBooks - Open Source Accounting/ERP/CRM
CRM
SugarCRM - Commercial Open Source CRM
Thunderbird - Reclaim your inbox
Server Software
www.Linux.org
PHP: Hypertext Preprocessor
MySQL Query Analyzer - Improving SQL Query Performance
OS
Welcome to Linux.com: Your Source for All Things Linux (Beware that not all software is compatable with Linux but Ubuntu or any other do offer a great OS environment)
Office Software
OpenOffice.org - The Free and Open Productivity Suite
https://www.google.com/accounts/Serv...cs.google.com/
Zip Software
7-Zip
Photo Editing Software
GIMP - The GNU Image Manipulation Program
FTP Uploader
FileZilla - The free FTP solution
Barcode
Barcode Writer in Pure PostScript
This is software of I used and there are probably others that will fit your need. When I first entered the world of open source software it was daunting. Some developers made it somewhat hard to use, so you had to purchase install service (never did). But after a year I understand what to look and which ones to choose.





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