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 What is open source software?
 What is open source really?
 Difference between open & closed source
software
 Features
 Examples for open source
 Advantages & Disadvantages to Mozilla
Firefox
 Advantages & Disadvantages to Open Source
 Advantages & Disadvantages to Linux

Open-source software is software whose source code is
published and made available to the public, enabling anyone to
copy, modify and redistribute the source code without paying
royalties or fees.

Open source code can evolve through community
cooperation. These communities are composed of individual
programmers as well as very large companies. Many of these
individuals programmers who start an open source project usually
end up as large companies with open source programs.

 Free to use
 Free to change
 Free to distribute
 An alternative to commercial software

 Open-source software is based on the idea that the user cannot
only view but also can change the source code of the existing
application.
 After initial production, open source software is released to the
development community and undergoes a secondary phase of
evolution. It is scrutinized by thousands of professional developers
across the globe who highlight bugs and security glitches in the
software.

 Closed-source software is hidden to prevent the user either
viewing or changing the code.
 Closed source software is developed in isolation with a small team
of developers. It isn't possible to build a team of hundreds to check
the code because the code is deemed proprietary and secret.

 Non-proprietary software which may or may not be used
commercially.

 Source code is generally made available.

 License terms differ from proprietary software license
terms

 For open-source software development many online
forums & blogs are available so that many developers
can come together and can produce a new one or can
help each others.

 Source code to original product always provided;

 Licensee can modify or enhance source code (create “derivative
works”) or include source code with other license types (create
“larger works”);

 Licensee may be required to share modifications with the world (in
source and/or binary form), but not necessarily;

 Licensee may be prohibited from charging royalties for derivative
and larger works, but not necessarily.

 Open Source programs tend to have more advanced features and
customizability than proprietary products

 Lower total cost of ownership.
 Reduced dependence on software vendors.
 Open source software gives you the power to control your
software's code. You have the right to modify the code to suit
your requirements.
 Anyone can easily modify the code of software to produce a new
featured software from existing one or to reduce the
functionalities of existing one.
 Open Source Software suffers from fewer security vulnerabilities
than Microsoft products.

1. Mozilla Firefox 2. Open Office

 Security: Using Firefox will block many websites from trying to
install spyware and other mal-ware from getting onto your
computer, which is a common problem with other browsers.
 Popup blocking: Firefox has a very good built in popup blocker that
blocks all those annoying popups when you open up a web page.
 Advanced Features: Firefox has many advanced features like
tabbed browsing that has all of your open pages in tabs in one
window instead of having every page on a different window.
 Extensions: Firefox has many useful extensions and plugins. They
are add-ons to the browser that adds functionality. They can be
anything from a new tool bar to a text-to-speech converter.
 Excellent Interface: Firefox has a clean, simple interface that
makes it easier to use and work on slower machines. The browser
only come with the essentials that makes it less prone to crashing,
easier to use, and function better on older or slower computers.
 It’s FREE!!

 Start up: It take a little longer to start up because it is not built in to
the Operating System like Internet Explorer and Safari.
 Compatibility: Some WebPages which do not follow the W3C
standards only work properly with Internet Explorer.

 No marketing schemes to try to force you to their product
 A good product will always be released, since the programmers
aren't paid to put out a product at a certain date
 More frequent updates, which always actually help the program.
 You can help the project keep on going through programming,
testing, and/or donations
 Made by regular people on their own time, not by a big corporation
like Microsoft
 Simpler and more user friendly design than its competitors.
 No need to worry about copyright issues.
 Isn't cluttered with useless “extra's”.
 It's free
 It's very easy to install, start up, and use

 It runs slower than Microsoft Office.
 It is not 100% compatible with Microsoft Word files (but it usually
works).
 The user interface is not quite as intuitive, but it can be learned
quickly.

 Cost: Linux is FREE!!
 Features: Linux contains an extremely powerful command line that
no Windows user could hope to replicate.
 Stability: Linux computers have been know to run for months
without ever needing to restart, while Windows may crash twice a
day.
 compatability: Linux can run on very old 386 computers, but it can
also run on supercomputers with hundreds of processors, and
everything in between.
 Security: Linux computers are far more secure than Windows
computers, which is why they run the majority of the Internet's web
servers.

 Complexity: For basic use, most distros are as easy to use as
Windows. Using advanced features however requires skill and
study.
 Number of options: Having hundreds of different distros available
can increase flexibility, but it can also make it hard to choose.
 User interface: Most Linux graphical user interfaces are not as
user-friendly as Windows.

3. 7-ZIP 4. VLC Media Player

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Open source software

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