A Portable Program is a software program which you can install it on any portable device. For eg :- USB Stick and you can carry this stick wherever you go. The main advantage of portable application is that it copies all the system files in the portable device during installation and usage so when you unplug the portable device all your data remain with you.
The Portable Application could be anything like Office utilities, email client, browser etc. I am going to list some popular portable application which can prove very handy in daily use. With the help of these Portable applications you can have your whole office and entertainment data in your USB Drives ready to get accessed on any computer.
Office Utilities
AbiWord : AbiWord is a free word processing program similar to Microsoft Word. It is suitable for a wide variety of word processing tasks.
Foxit PDF Reader : With over 50 million users all over the World, Foxit is the small and fast PDF viewer
OpenOffice : A multiplatform and multilingual office suite and an open-source project. It has all important office features like word processing, presentations, spreadsheets, databases etc.
Instant Messaging Clients
Pidgin : Pidgin Portable is a multi-protocol instant messaging client that works with AOL Instant Messenger, ICQ, MSN Messenger, Yahoo! and more.
Trillian : Trillian is a multi-client application that allows you to connect to Yahoo, MSN, AIM, ICQ, and IRC in one program.
Miranda : Miranda IM is a multi protocol instant messenger client for Windows. Miranda IM uses very little memory and is extremely fast. It supports ICQ, AIM, MSN, Jabber, Yahoo, IRC and more.
Web Browsers
Mozilla Firefox Portable Edition : Mozilla Firefox is a fast, full-featured web browser that’s easy to use. It has lots of great features including popup-blocking, tabbed-browsing, integrated search, improved privacy features, automatic updating and more.
Opera@USB : A powerful and portable web browser based on Opera.
Portable Chrome : Portable version of the popular Google Chrome Web Browser also known as Chromium.
Media Players
VLC Media Player Portable : VLC Media Player Portable is the popular VLC media player packaged as a portable app, so you can take your audio and video files along with everything you need to play them on the go.
SMPlayer : SMPlayer intends to be a complete front-end for MPlayer, from basic features like playing videos, DVDs, and VCDs to more advanced features like support for MPlayer filters and more.
Ubiquitous Player : Ubiquitous Player is All-In-One multimedia player, web browser, image viewer, text editor and file manager.
Antivrus/Firewall Software
Antivir : Protects your computer against dangerous viruses, worms, Trojans and costly dialers.
Avast! Virus Cleaner : Avast! Virus Cleaner is available free for every user. This tool will help you remove selected worm infections from your computer.
Dr.WEB CureIt : Easy to use free curing utility to clean your computer infected with viruses and various unwanted codes by the Dr.Web Anti-virus updated once or several times an hour.
ClamWin Portable : ClamWin is a Free Antivirus for Microsoft Windows. It provides a graphical user interface to the Clam AntiVirus engine
Multi Virus Cleaner : This Program is Stand Alone Utility boasts a fast, user-friendly scanner that requires minimal processing power and is an excellent choice for repairing a compromised system.
Email Clients
Mozilla Thunderbird : Mozilla Thunderbird is the safe, fast email client that’s easy to use. It has lots of great features including quick message search, customizable views, support for IMAP/POP, RSS support and more.
Koma-Mail : Koma-Mail does not need an installation, so that you can run Koma-Mail from your flash drive but, of course, also on your desktop.