Open Source Software
Open-source software (OSS) is computer software that is available in source code form: the source code and certain other rights normally reserved for copyright holders are provided under an open-source license that permits users to study, change, improve and at times also to distribute the software.
Open source software is very often developed in a public, collaborative manner. Open-source software is the most prominent example of open-source development and often compared to (technically defined) user-generated content or (legally defined) open content movements.
Example Linux,UBUNTU,MYSQL,Fedora Core,UNIX
Advantages and disadvantages of the open source software
Mostly software free or less cost.
Right to use the software in any way.
No single entity on which the future of the software depends.
No per-copy fees can be asked for modified versions.
Availability of the source code and the right to modify it.
Freeware is software that is available for use at no cost or for an optional fee,but usually with one or more restricted usage rights.Freeware is in contrast to commercial software, which is typically sold for profit, but might be distributed for a business or commercial purpose in the aim to expand the marketshare of a “premium” product. According to the Free Software Foundation, “freeware” is a loosely defined category and it has no clear accepted definition, although FSF says it must be distinguished from free software (libre).
Example Adobe reader , Skype,Microsoft V-Chat,X-Lite etc.
Shareware is proprietary software that is provided to users without payment on a trial basis and is often limited by any combination of functionality, availability (it may be functional for a limited time period only). Shareware is often offered as a download from an Internet website or as a compact disc included with a periodical such as a newspaper or magazine. The rationale behind shareware is to give buyers the opportunity to use the program and judge its usefulness before purchasing a license for the full version of the software.
Shareware is usually offered either with certain features only available after the license is purchased, or as a full version but for a limited trial period of time. Once the trial period has passed, the program may stop running until a license is purchased.
Example Kaspersky Antivirus ,Wondershare
Free and open-source software (F/OSS, FOSS) or free/libre/open-source software (FLOSS) is software that is both free software and open source. It is liberally licensed to grant users the right to use, copy, study, change, and improve its design through the availability of its source code.In the context of free and open-source software, free refers to the freedom to copy and re-use the software, rather than to the price of the software.
GNU is a recursive acronym for “GNU’s Not Unix!”, chosen because GNU’s design is Unix-like, but differs from Unix by being free software and containing no Unix code. Programs released under the auspices of the GNU Project are called GNU packages or GNU programs. The system’s basic components include the GNU Compiler Collection (GCC), the GNU Binary Utilities (binutils), the bash shell, the GNU C library (glibc), and GNU Core Utilities (coreutils).
The Free Software Foundation (FSF) is a non-profit organization founded by Richard Stallman on 4 October 1985 to support the free software movement, a movement which aims to promote the universal freedom to create, distribute and modify computer software,with the organization’s preference for copyleft, such as with its own GNU General Public License, being used to license software whose modifications retain these permissions.
Open Source Initiative Abbreviated OSI, a non-profit organization that promotes the integrity of the open source definition by certifying products with the OSI Certified Open Source Software mark. OSI is comprised of board members who make up its directorship and is not a membership organization.