Open Source is specially developed for Programmer so that they can Improve the earlier Version. Open Source promotes free redistribution and access to the product detail. In Open Source software you get Free software as well as Source code of that software which is mostly used by developers and Programmer. 
1. Mozilla Firefox
Mozilla Firefox is a free and open source web browser. Mozilla Firefox include tabbed browsing, spell checking, Search(Crtl+f), live bookmarking, private browsing and download manager.Firefox uses a sandbox security model for Security and also uses SSL/TLS to protect communications with web servers using strong cryptography when using the HTTPS protocol.
[Download Mozilla Firefox]
2. Mozilla Thunderbird
Mozilla Thunderbird is a free, open source, cross-platform email and news client developed by the Mozilla Foundation.Mozilla Thunderbird allows you to reads RSS feeds like streams of email with filters, search and labeling.Also manage multiple POP and IMAP email accounts using Mozilla Thunderbird.
[Download Mozilla Thunderbird]
3. OpenOffice
OpenOffice is one of the leading open-source office software mainly used for word processing, presentations, databases, spreadsheets and graphics. OpenOffice stores all your data in an international open standard format.
[Download OpenOffice]
4. Notepad++
Notepad++ is a free source code editor and supports several languages. Running in the MS Windows environment, its use is governed by GPL License.
[Download Notepad++]
Know More About Open Source
List of Open Source Operating systems
Android – operating system derived from Linux
FreeBSD — operating system derived from Unix
Linux — family of Unix-like operating systems
OpenIndiana — a free Unix-like operating system
List of Open Source Programming languages
PHP — scripting language suited for the web
Perl — a general purpose programming language
Python — general purpose programming language
Ruby — general purpose programming language.
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