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MKVToolnix is a freeware utility that allows you to create, alter, inspect, etc., video files with the MKV format.You can use MKVToolNix to create, split, edit, mux, demux, merge, extract, or inspect Matroska files.
MKVToolnix program will also work with other video formats including AVI, MPEG, MP4, MPEG, MPEG1/2, h264, and more, as well as some video codecs such as VP9, audio including AAC, FLAC, MP2, MP3, AC3, DTS/DTS-HD, Vorbis and most subtitle formats including SRT, PGS/SUP, VobSub, ASS, and SSA.

TreeSheets is a mashup of many different program types including spreadsheets, mind mappers, outliners, PIMs, text editors and small databases. It has a tabbed interface and is lightweight and fast, using few system resources even with large files.

It's like a spreadsheet, but much more suitable for complex data because it's hierarchical. It's like a mind mapper, but more organized and compact. It's like an outliner, but in more than one dimension. It's like a text editor, but with structure. It is capable of many kinds of data organization, including todo lists, calendars, project management, brainstorming, organizing ideas, planning, requirements gathering, presentation of information, etc.

Functional in 64-bit and cross platform (Linux and Mac).

Notepad++ is a tabbed source code editor and Notepad replacement with a customizable interface. Includes source code "folding", allowing users to quickly reduce and expand sections of code to see the overall document. In addition, it features multi-language syntax highlighting, auto-completion, Perl-compatible regular expression search/replace, macro recording and playback, document map etc.

A host of additional functionality is available via the plugins admin view, including tools for file analysis, programming languages, viewers, calculations, user interface and many more.

Alternatively, Notepad++ Portable and the outdated X-Notepad++ clean the local folder.

Tablacus Explorer is a quad-pane file manager that supports tabs, mouse gestures, favorites, filters and different view styles. Its functionality can be extended via plug-ins which can be installed and updated from within the program.

Password Safe is a database for encrypting sensitive information. Once opened with a master password, you can copy a password and paste it directly into your application. Alternatively, Password Safe supports "Auto Type" that enters the username and password into the target application by simulating keystrokes.

The database is encrypted using the Twofish encryption algorithm. A Linux version (currently in Beta) is also available from the website.

Alternatively, Password Safe Portable and the outdated X-Password Safe are stealth.

Rainlendar is a skinnable, easy-to-use calendar that resides on your desktop and shows the days of the current month. You can add events and tasks with customizable icons and formats to the calendar and be reminded when they occur. Rainlendar uses the standard iCalendar format to store its events and tasks so you can easily transfer them between applications.

Cross-platform (Windows, Linux, OS X).

Note: Rainlendar Lite is the freeware version of Rainlendar Pro (Payware). The lite version is missing network shared calendars, Outlook support and other features.

PortableApps.com Platform is an all-in-one tool for portable software download, management and updating. An included launcher shows nested folders organized automatically by function or favorite status, as well as a cascading app view on right-click of the tray icon. The program's appearance can be customized with transparency and several color, texture, and background options.

Other tools include a find-as-you-type search functionality, available cloud installation, drive error checker, backup/restore utility, portable fonts, automatic application closing on shutdown and more. The program can also work with portable software outside of the PortableApps format (see Extract instructions).

Functional in 64-bit and WINE, includes broad language support and proxy support.

AutoHotkey is a powerful automation and scripting tool with an option to export to a self-contained executable. Possible uses include assigning the hotkey "Ctrl-Alt-F" to launch Firefox, making abbreviations expand to their full definition as you type them, or saving time by setting the computer to auto-click a confirmation screen.

The program can create entire applications and has been used to create many hosted here on PortableFreeware including 7plus, WallPaper Randomizer, Gridy and many more.

Note: Though it's bit outdated (from 2021), Pulover's Macro Creator can be used as a macro recorder and includes an "Export to AHK" function.

Process Explorer is an advanced task manager. It is an indispensable tool for both beginners and power users. I use it all the time to kill tasks that refuse to be killed, or find what which processes are still holding on to a particular file or DLL so it refuses to be deleted.

Alternatively, Process Explorer Portable is also available, which is stealth.