An elfpack patched into FW. It is the most world-opening patch for your phone, as it offers to load compiled .c code during runtime as elf files. Elf runs 'bare-metal' on OS, if it crashes, your phone mostly does too. Elfpack consists of elf-loader and elf-library. Get elfpack builds here.
Elfs usually come with or create a .bcfg file for app configuration. Often they come with other files like images, text or binary files. Install correctly, follow the guides.
You can run elfs as daemon too (=autostart on unlock after boot).
BCFG-edit is the tool to edit configuration of elfs.
Bookmanager>insert here> is the “task manager”. Books are the open pages in OS. Has elf management.
Dyn stuff is the library part for elf loader. You can port DYN too and compile e.g. with IAR embedded
#TODO

https://archive.perk11.info/elfse/

Compile yourself, also see Elf source codes.