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Mozilla Thunderbird is a skinnable, feature-rich email, calendar, task and instant messaging client with support for plugins and many protocols. It comes with advanced search tools, message filtering, Bayesian spam detector, built-in spell checker, mailbox compression and many more. Program features can be extended with add-ons, including a specialized version of email encryption tool GPG.

Email protocols include SMTP, POP3, IMAP (including uploads, albeit a date issue), NNTP and RSS and chat support for IRC, Twitter, XMPP, Google Talk, and Matrix. Also supports OAuth for use with accounts that require it instead of a password.

Mozilla Thunderbird, Portable Edition is a special build licensed by Mozilla. Alternatively, X-Thunderbird is also available. For XP/Vista, version 52.9.1 is available here.

SMPlayer is a feature-rich, skinnable player that views most media without any dependency on installed codecs, as well as streaming media, Youtube and DVD video. Audio, video and subtitle settings for individual files are all remembered between sessions so you can start again exactly where and how you left off. Supports subtitle downloading, youtube support, audio and subtitles delay adjustment, equalizer, filters, playlist support and much more.

The program is a frontend for MPlayer and mpv that also works on Linux. Alternatively, SMPlayer Portable (stealth and adjusts paths) and the outdated X-SMPlayer and are also available.

GIMP (GNU Image Manipulation Program) is a powerful photo and image editor for composition and authoring. It can be used as a simple paint program, a high quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter and much more.

The program is cross-platform with versions available for Mac and Linux. GIMP Portable is the PortableApps version of the program.

Notes:

1. If you're willing to risk trying a 2012 add-on, mimic Photoshop adjusts GIMP's layout to a switched on Photoshop-like single-window mode.
2. Alternatively, another portable package (though outdated from 2021) is X-Gimp.

EditPad Lite is a fast and lightweight general-purpose text editor. It allows you to open many files simultaneously and switch between them using tabs. It also supports many functions for text manipulation and conversion.

A 64-bit version is available. EditPad's installer now automatically installs a 64-bit version of EditPad on 64-bit Windows.

Rename Master is a utility for renaming large groups of files with a few clicks. It is suitable for anyone working with websites, file archives, or collections of music, videos and pictures. This utility will add, remove, or replace parts of the filename.

Supports renaming via file properties, MP3 tags, JPEG JFIF and EXIF tags. For example, you can rename a photo based on when it was taken or MP3 based on when it was recorded.

PeaZip is a feature-rich file archiver with broad support for 200+ file types. The file manager interface includes a hash tool, file wipe, file associations, file splitter, themes, estimated compression level, system benchmark, image crop/rename and much more.

Formats supported include most mainstream archive formats, including ZIP, 7Z, ACE, BZIP2, CAB, GZIP, TAR, UPX, ZIPX, as well as it's own PEA format. Can extact but not create MSI and RAR files.

Note that tools setup through the Task Scheduler are not portable.

Cross platform with clients for Mac, Linux, and BSD, as well as a 64-bit version is available. Alternatively, PeaZip Portable portablizes bookmarks and includes both 32 and 64-bit versions, automatically using the proper one on each PC.

PortableApps.com AppCompactor allows you to compress whole directories including applications, file libraries and zip files. The program is a powerful compression tool that unites 7-Zip and UPX inside a user-friendly wizard. For applications, this saves disk space and increases performance when running from a slow media (like flash drives). For archives, this will recompress DLL, EXE, ZIP, JAR, IRC, PYD and BIN files to their maximum compression settings, as well as an option to decompress an app's binary files that were previously compressed with UPX.

All files are tested using UPX's test feature after compressing. Files smaller than 4K are automatically skipped as compressing will not save space on the drive. The standard Microsoft Visual C runtimes are skipped to prevent antivirus false-positives. Advanced configuration can be done with apps in PortableApps.com Format.

Note: As UPX will alter the EXEs and DLLs (reversible using the Decompress option in the AppCompactor) and some apps may have issues with Zip or Jar files compressed further, users should backup software and test it after processing.

TheSage is an English dictionary and thesaurus that contains over 250,000 words with 2.1 million word relationships. It also features various related word tools such as a concordancer, rhyming dictionary, phonetic, and more. Features include cross-referencing, wildcard and anagram search, multi-session history, etc.

Functional on 64-bit systems.

Note: some options are limited to PRO version subscribers.

TreeSize Free shows you instantly which files or folders are taking up the most space on your harddisk without using heavy system resources or reading the drive extensively.

Alternatively, TreeSize Free Portable is pre-configured to be portable, automatically adjusts paths and is stealth.