Open/Free soft must have

This is the best antivirus toolkit. (Warning! unfortunately, only in Russian)

Fullscreen word processor

Application for running Windows software on operating systems that are normally not supported.

Create bootable USB flash drives (cross-platform)

Programming language

Native Git client

Create bootable USB flash drives

Messaging app

Arduino IDE

Text editor for code

Dark-Net

Autoruns shows you what programs are configured to run during system bootup or login, and shows you the entries in the order Windows processes them

Winamp-like media player

Tool for testing and formatting flash-drives

DOS-emulator

Remote connections manager

Podcast management

Terminal based IRC client

Network protocol analyzer

SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security

Broadband speed analysis tool

Unix-like environment and command-line interface for Microsoft Windows

Details on CPU, RAM, real-time stats

Scans computer to find settings that may have been changed by spyware, malware or other unwanted programs.

File-unlocker. Be careful Bundleware! (Uncheck a task checkbox at setup initialisation)