Hiren's BootCD!

Hiren's Boot Disk was great for the Windows XP, Vista, and 7 era of computing. Unfortunately it was discontinued in 2012, with FalconFour's Ultimate Boot CD following it's demise in 2013. So I took on the honor of bringing forth an up-to-date boot disk for everyone. MediCat USB aims to replace the discontinued and dated Hiren's Boot Disk. It is geared towards modern hardware, and follows the Ubuntu release cycle with a newly-updated release every 6 months.

SystemRescueCd is a Linux system rescue disk available as a bootable CD-ROM or USB stick for administrating or repairing your system and data after a crash. It aims to provide an easy way to carry out admin tasks on your computer, such as creating and editing the hard disk partitions. It comes with a lot of linux software such as system tools (parted, partimage, fstools, ...) and basic tools (editors, midnight commander, network tools). It requires no installation. It can be used on linux servers, linux desktops or windows boxes. The kernel supports the important file systems (ext2/ext3/ext4, reiserfs, reiser4, btrfs, xfs, jfs, vfat, ntfs, iso9660), as well as network filesystems (samba and nfs). »

F4UBCD, FalconFour's Ultimate Boot CD, will be the last Boot CD you'll ever need.

Knoppix is an operating system based on Debian designed to be run directly from a CD / DVD (Live CD) or a USB key (Live USB), one of the first of its kind for any operating system. When starting a program, it is loaded from the removable medium and decompressed into a RAM drive. The decompression is transparent and on-the-fly.Although Knoppix is primarily designed to be used as a Live CD, it can also be installed on a hard disk like a typical operating system. Computers that support booting from USB devices can load Knoppix from a live USB flash drive or memory card.There are two main editions of Knoppix: the traditional Compact Disc (700 megabytes) edition and the DVD (4.7 gigabytes) "Maxi" edition. Each of these main editions has two language-specific editions: English and German.Knoppix mostly consists of free and open source software, but also includes proprietary software »

A simple tool to recover access to your Operating Systems.

A completely free bootable CD that contains a load of useful tools you can make use of in a variety of situations like analyzing, recovering and fixing your computer even if the primary operating system can not be booted.

Rescatux is a GNU/Linux rescue cd (and eventually also Windows) but it is not like other rescue disks. Rescatux comes with Rescapp. Rescapp is a nice wizard that will guide you through your rescue tasks.

From the site: "I have been a field service technician for many years, which means that I am out on my own fixing computers on-site and don’t always have the support of a shop or colleagues to help. Field service work requires one to be able to quickly and routinely get the problem diagnosed and solved right the first time, otherwise it means another trip back out to a client’s location.

Grml provides an excellent selection of software packages for installation, deployment and system rescue. You'll get sysadmin's favourite tools. Choose between a x86 and an amd64 version depending on your needs or just grab the multiboot ISO grml96, providing 64bit and 32bit ISOs in one single place.

ALT Linux is a set of RPM-based operating systems built on top of the Linux kernel and Sisyphus packages repository

Anvi Rescue Disk was designed to be used when standard antivirus software fail to detect and clean various computer infections, especially boot-sector viruses like ransomware. The Anvi Rescue ISO image, Rescue.iso, can be burned on a CD/DVD or a bootable USB device using your disc burner to launch the infected computer from there to troubleshoot.How it works: Anvi Rescue Disk helps you troubleshoot your infected computer by attempting to detect and remove the infections by starting the computer to another operation system. The process may take some efforts but does work when standard antivirus software fails to do its work. »

Active@ Data Studio (Live CD) contains a set of both desktop applications and a bootable image for booting up any system into a DOS or Windows environment. Whether you need to perform data recovery, data imaging, or to securely erase data, Active@ Data Studio allows you to run the utilities from within Windows or to boot a system up from a self-contained boot environment.

Hoek’s Tools is a vast collection of portable utilities for the management, diagnosis and repairing of computer problems, recover lost or deleted files or cracking passwords. There are literally hundreds of utilities. Hoek’s Tools can be used as a collection of portable repairing and diagnostic utilities which can be run from within Windows without installation. To do this insert prepared CD or USB drive and select a utility from the HT program launcher menu. To open launcher menu you need run \htools.exe »

Finnix is a small, self-contained, bootable Linux CD distribution for system administrators, based on Debian GNU/Linux. You can use it to mount and manipulate hard drives and partitions, monitor networks, rebuild boot records, install other operating systems, and much more.