Internet

Browsers

Google Chrome Portable (Freeware) - fast, simple, themeable browser
Maxthon Portable (Freeware) - fast, powerful browser
Mozilla Firefox, Portable Edition - the award-winning web browser that's safe and secure
Iron Portable - advanced web browser
Opera, Portable Edition (Freeware) - lightweight, customizable browser
Private Browsing by PortableApps.com - enhanced private browsing
SeaMonkey, Portable Edition - complete internet suite (browser, email, chat, newsgroups)

Chat & Instant Messaging

aMSN Portable - chat and video chat on MSN/Windows Live
Instantbird Portable - customizable instant messaging on AOL, Facebook, Google, MSN and more
KVIrc Portable - full-featured IRC chat client
Miranda IM Portable - chat with AOL, MSN and Yahoo users in a customizable interface
PChat Portable - full-featured IRC chat client
Pidgin Portable - chat with AOL, MSN and Yahoo users in an easy-to-use interface
QuteCom Portable - softphone, text, audio and video chat
Skype Portable (Freeware) - instant messaging, video chat and phone calls

Download Managers and Accelerators

DamnVid Portable - video downloader and encoder
DownThemAll! Extension (for Firefox) - download the files and images you want faster
WinWGet Portable - take and manage your downloads on the go
wxDownload Fast Portable - multi-threaded download manager

Email

PopMan Portable - lightweight email notifier
Mozilla Thunderbird, Portable Edition - the handy email client

File Sharing

qBittorrent Portable - lightweight bittorrent client
µTorrent Portable (Freeware) - lightweight bittorrent client

FTP, SFTP and SCP Clients

FileZilla Portable - the full-featured FTP client
FireFTP Extension (for Firefox) - a lightweight extension
WinSCP Portable - SFTP, FTP and SCP client

Podcast Receivers

gPodder Portable - podcast receiver and manager
Juice Portable - podcast receiver and manager

RSS Readers

Feed Notifier Portable - RSS/ATOM popup feed notifications
Mozilla Firefox, Portable Edition (Live Bookmarks) - Simple RSS reading is built-in
Sage Extension (for Firefox) - A full-featured RSS extension

Telnet & SSH

PuTTY Portable - lightweight telnet and SSH client

Web Editors

KompoZer Portable - The easy-to-use web editor