Homebrew developer Pirata Nervo has released an update to NervOS, an iR Shell-esque shell replacement for the PSP that aims to provide a user friendly and feature rich interface.
Version 1.4 introduces multi-tasking support, an integrated music player, a minimalistic volume bar, and a task manager for monitoring running processes.
Download NervOS v1.4
[Release] NervOS 1.4 [Endless Paradigm]