This document provides an overview of open source software. It discusses the advantages of open source like access to source code, ability to fix bugs and customize. It also discusses licensing models like GPL and BSD and how companies use open source software. It provides examples of open source projects like Red Hat, JBoss, Mobicents which provides telecom middleware. It encourages participation and contribution to open source.

1. Name of Presentation
TECHKRITI,
Red Hat
IIT, K
Presenter
Feb 2009
Amit Bhayani <amit.bhayani@gmail.com>

2. O P E N S O U R C E == F R E E D O M!!!

3. TRUTH HAPPENS!
http://www.redhat.com/magazine/008jun05/features/trut
h_happens/

4. What the heck is software?
Source
Binary

5. Closed Source – Am I behind the bars?
 You can't
● See the Source
● Can't fix bug
 Can I pass the software to my
girlfriend?
● What?? NO!
 Well I have found the bug in this
(Licensed) Software, what next?
● Well done my friend. Call Customer
Care, tell them. Wait for new version
Zzzzzzzzz

6. But we spoke about
F R E E D O M!!!
OPEN SOURCE SOFTWARE
is the solution.

7. Open Source – Advantages
 You can
● See the Source
● Can fix bug
● Add features
 Can I pass the software to my girlfriend?
● Yes! Pass it to all you love.
 Well I have found the bug in this (Open Source) Software, what
next?
● Well done my friend. Fix it your self taking help from community and be proud!
● Raise it in bug list and let some one fix it
● The commercial model - Support

8. Open Source – Advantages
 There is big community around it. You are part of
it.
● Very likely that feature you want is already present in OSS
● If not very likely there is other company/organization seeking
same feature, distribute the task and keep cost low.
 Millions downloading the OSS.
● Very difficult to miss any bugs by 2 * millions eye (Assuming
all who downloads have a pair of eye )
● JBoss Application Server downloads have crossed 1 million
mark few months ago
 Most of the OSS have Roadmap for next
foreseeable future made public
● Community drives the RoadMap. YOU DRIVE IT!
 Docs also nicely covered.

9. But I ain't developer ...
My aspiration is to go for MBA
 OSS greatly reduces the cost while maintaining the quality.
● You would be responsible to keep the cost low.
 Cutting Edge Technology
● Wouldn't you want to have latest?

10. I have brilliant Idea ... should I make it
OSS
 Just check if it already exist?
● There are OSS Hosting Sites like
● SourceForge http://sourceforge.net/
− This alone has 100K + projects hosted
● Google Code http://code.google.com/
● java.net http://java.net/
● They provide
● SVN / CVS Server's
● Forums / Public Groups
● Wiki Page
 If its really new – GO AHEAD!

11. I have no ideas
 Am I useless?
● Be the part of existing OSS
● No one starts OSS without ever
using/contributing to other OSS
 What is your interest?
● Statistics shows OSS has wide acceptability by following ranking
I. Operating System – Linux is De Facto
II.Data Base – MySQL, Postgress
III.Middle-ware – JBoss
IV.Telco Middle-ware – Mobicents
V.Others

12. The License Model
 Developer owns the code unless he/she grants you a license.
 Copyright!
 Over 50 approved Licenses http://www.opensource.org/licenses
 Why So many Licenses?
 Basically divided it two BSD and GPL

13. The License Model - BSD
 Berkeley Software Distribution license
 Use it the way you want, but we are not responsible if it blows
up your “Space Rocket” or Your “Hello World Program”
● Use in your product which is non-open source
● Make changes to existing code, add new features and never ever talk to anyon
about this. Shhhhh
 Very flexible

14. The License Model - GPL
 License Rights Granted under the GPL
● Licensee may run the Program
● Licensee may copy and distribute verbatim copies of the Program’s source code
● Licensee may create “derivative works” of the Program
● Licensee may distribute such derivative works
 If a licensee of a Program distributes that Program, or any “work
based on the Program,” such licensee must:
● also distribute the source code for the Program and for the work based on the
Program, and
● cause such works to be licensed at no charge under the terms of the GPL

15. Permutations and Combinations
 Your piece of code will depend on many libraries
● BSD can't have GPL Code
● GPL can have BSD
 Scared about all these License Jargons?
● Don't be! This is till simpler than Licensed Software
● Frankly how many of you ever read the complete
license before clicking that “I Accept” button while
installing License Based Software?

16. But all these License's have common
points
 Source Code available
 Distribute the code
 Making changes allowed
 Use without royalty

17. The OSS Business Model
 Companies back OSS by providing indemnity
 Provide
● Support
● Consulting
● Training
 They fuel OSS and also have in-house core developers
 See RedHat
 See JBoss

18. C
F
Q
o
r Why Companies use OSS
u
s
e
a
t
e  Depends on individual
l
(
d
i
M
o
t
o
m
y
n
(
e
t Cost
Freedom
y
h
,
e
p
r
i
n
c Quality
i
p
l
e

19. Mobicents -
 Telco middle-ware platform
● JAIN SLEE Server
● Sip Servlets Server
● Media Server
● Presence Server
● Diameter
 http://www.mobicents.org/

20. Mobicents JAIN SLEE Server

21. Mobicents Sip Sevlets Server

22. 2
Mobicents Media Server
SIP
RTP
IVR Conference
SIP Application Application
SIPhone SIP Mobicents
JAIN SLEE Server
MGCP
IP
IP
Mobicents Media
RTP
Server
Mobile / Land
Phone SS7
Legacy
Protocols
MSC

23. 3
Google Summer of Code - 2010
• What is GsoC
– Starts from March 2010
• http://groups.google.com/group/google-summer-of-code-discuss/
–
• Mobicents also proposing
– Automated Speech Recognition (ASR) Project
– Text-to-speec (TTS) Project
– Media Server Markup Language – MSML
–
• Send your queries to mobicents-public@googlegroups.com

24. Confidential
Questions?
http://amitbhayani.blogspot.com
24