We've reported on Reverse-Engineering PS VR and a C Library for Morpheus called LibPSVR, and today PlayStation developer BigBoss tweeted that Sony has made available the sources for Morpheus 2.50 for PS4 developers to examine. 
Download: morpheus_bridge-PSVR-01.500.tar.bz2 / morpheus_bridge-PSVR-02.000.tar.bz2 / morpheus_bridge-PSVR-02.500.tar.bz2
For a list of other open source software used in PlayStation VR see HERE or the listing below.
Open Source Software Used in PlayStation VR
Download: morpheus_bridge-PSVR-01.500.tar.bz2 / morpheus_bridge-PSVR-02.000.tar.bz2 / morpheus_bridge-PSVR-02.500.tar.bz2
For a list of other open source software used in PlayStation VR see HERE or the listing below.
Open Source Software Used in PlayStation VR
- The Android Open Source Project
- bsdiff
- busybox
- bzip2
- CLAPACK
- cryptsetup
- e2fsprogs
- EGLIBC
- FFTS -- The Fastest Fourier Transform in the South
- libcap-ng
- libdevmapper
- libfdt - Flat Device Tree manipulation
- libgcrypt
- libgpg-error
- libusb
- libuuid
- Linux kernel
- Mini-XML
- morpheus bridge
- NetBSD: printf.c
- newlib
- OpenGL Mathematics
- OpenSSL
- procps
- SHA