SYSLINUX

The Syslinux Project is a suite of five different boot loaders for starting up Linux distros on personal computers. It was primarily developed by H. Peter Anvin.
Components.
The Syslinux Project consists of five different boot loaders:
The project also includes two separate menu systems and a development environment for additional modules.
SYSLINUX and ISOLINUX.
SYSLINUX was originally meant for rescue floppy disks, live USBs, or other lightweight environments. ISOLINUX is meant for live CDs and Linux installation CDs.
A minor complication is involved when booting from compact discs. The El Torito standard allows booting in two different modes:
To have this choice is sometimes useful, since ISOLINUX is vulnerable to BIOS bugs. For that reason, it is handy to be able to boot using SYSLINUX. This mostly affects computers built before about 1999, and, in fact, for modern computers the "no emulation" mode is generally the more reliable method. Newer ISOLINUX versions support creation of so-called "hybrid ISO" images, that put both the "El Torito" boot record of the compact discs and the master boot record of hard disks into an ISO image. This hybrid image could then be written to both a compact disc or a USB flash drive.
PXELINUX.
PXELINUX is used in conjunction with a PXE-compliant ROM on a network interface controller (NIC), which enables receiving a bootstrap program over the local area network. This bootstrap program loads and configures an operating system kernel that puts the user in control of the computer. Typically, PXELINUX is used for performing Linux installations from a central network server or for booting diskless workstations.
EXTLINUX.
EXTLINUX is a general-purpose bootloader, similar to LILO or GRUB. Since Syslinux 4, EXTLINUX is capable of handling Btrfs, FAT, NTFS, UFS/UFS2, and XFS filesystems.
COMBOOT.
SYSLINUX can be extended by COMBOOT modules written in C or assembly language. 32-bit modules typically use the codice_1 filename extension. Version 5 and later do not support 16-bit codice_2 modules.
Hardware Detection Tool (HDT).
Since the 3.74 release, the Syslinux project hosts the Hardware Detection Tool (HDT) project, licensed under the terms of GNU GPL. This tool is a 32-bit module that displays low-level information for any IA-32–compatible system. It provides both a command-line interface and a semi-graphical menu mode for browsing. HDT is also available as a bootable ISO and a 2.88 MB floppy disk image. The last update of HDT was in 2015; it has since been discontinued.