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Opera is a Web browser and Internet suite developed by the Opera Software company. The browser handles common Internet-related tasks such as displaying web sites, sending and receiving e-mail messages, managing contacts, chatting on IRC clients, downloading files via BitTorrent, and reading Web feeds. Opera is offered free of charge for personal computers and mobile phones.

Features of Opera include tabbed browsing, page zooming, mouse gestures, and an integrated download manager. Its security features include built-in phishing and malware protection, strong encryption when browsing secure Web sites, and the ability to easily delete private data such as HTTP cookies.

Opera runs on a variety of personal computer operating systems, including Microsoft Windows, Mac OS X, Linux, FreeBSD, and Solaris. Evaluations of Opera have been largely positive, and Opera has innovated many key features of modern browsers. Despite these factors, Opera has captured only a small fraction of the worldwide personal computer browser market. It does, though, have a stronger market share on mobile devices such as mobile phones, smartphones, and personal digital assistants. Editions of Opera are available for devices using the Symbian and Windows Mobile operating systems, as well as Java ME-enabled devices. Approximately 100 million mobile phones have shipped with Opera pre-installed. Opera is the only commercial web browser available for the Nintendo DS and Wii gaming systems. Some television set-top boxes use Opera. Adobe Systems has licensed Opera technology for use in the Adobe Creative Suite.

Safari is a web browser developed by Apple Inc. First released as a public beta on 7 January 2003 on the company's Mac OS Xoperating system, it became Apple's default browser beginning with Mac OS X v10.3 "Panther". Apple has also made Safari the native browser for the iPhone OS. A version of Safari for the Microsoft Windows operating system first released on June 11, 2007 supportsWindows XP, Windows Vista, and Windows 7. The current stable release of the browser is 4.0.4 for both Mac OS X and Windows. Safari had a 4.24% market share in September 2009.

Mozilla Firefox is a free and open source web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation. A Net Applications survey put Firefox at 25% of the recorded usage share of web browsers as of November 2009, meaning Firefox is used by about 1 in 4 internet users, making it the second most popular browser in terms of current use worldwide after Microsoft's Internet Explorer, and the most used browser independent of any one operating system.

To display web pages, Firefox uses the Gecko layout engine, which implements most current web standards in addition to several features which are intended to anticipate likely additions to the standards.

Latest Firefox features include tabbed browsing, spell checking, incremental find, live bookmarking, a download manager, private browsing, location-aware browsing (aka "geolocation") based exclusively on a Google service and an integrated search system that uses Google by default in most localizations. Functions can be added through add-ons, created by third-party developers, of which there is a wide selection, a feature that has attracted many of Firefox's users.

Firefox runs on various versions of Mac OS X, Microsoft Windows, Linux, and many other Unix-like operating systems. Its current stable release is version 3.5.5, released on November 5, 2009. Firefox's source code is free software, released under a tri-license GNU GPL/GNU LGPL/MPL.

Nanti bakal ada sistem operasi baru lagi yang di keluarkan oleh Google yaitu Chrome OS. Pasti kita udah tau tentang Google kan? Google merupakan suatu alat untuk mencari sesuatu di internet / Search Engine. Hampir setiap saat kita menggunakan Google untuk mencari sesuatu di internet dan untuk menambah wawan kita tentang sesuatu yang belum kita ketahui. Akan tetapi disini Google mencoba mengeluarkan suatu sistem operasi yang di beri nama Chrome OS. Tau sendiri kan Google sudah banyak merebut perhatian masyarakat dunia yang digunakan sebagai Browser. Aspek utama dari Google Chrome ini adalah dengan mengandalkan kecepatan, kemudahan, dan keamanan. Jadi anda akan sangat puas jika memakai sistem operasi ini.