Extreme Development - Hundreds, and sometimes thousands, of programmers contribute to the development of Open Source software. These programmers, often from around the world, provide a talent pool that is unparalleled in the closed source world of traditional software development.
Quick Bug fixes - Just as hundreds of programmers can work to improve the Open Source project, so do hundreds working to eliminate bugs in the system. In fact, OSD is intrinsically setup to expose bugs quickly and allow timely resolutions.
Massive Support - All Open Source code is available to anyone who wishes to use, view or modify the code. This completely open system allows for questions to studied and resolved quickly by a very large collaborative Internet based communities, such as questionexchange.com
Hostage Proof - The OSD model does not allow any one person, party, company or country to control the software. In the OSD model, no one is in the position to demand upgrades, or charge for answers or support. In the traditional, closed source world, you bought into a company's ideology as much as their software
No license cost for software of open source development, all information is open too with no hidden agendas.
In case of any problems you get free guaranteed support from the software developers community. This very high peer support, promotes all new converts to develop acceptable levels of code quality through quick training.
More reliable than commercial software; this robust software costs nothing.
Fixing any problem even when related to security can be solved within minimum time since the source code of the software is in hand and due to the availability of the large software support forum; which is not normally possible in closed commercial software.