Misc tools other
CD-Tool - Read/write sectors from/to an ISO, read information about an ISO, extract/insert files, as well as create or apply patches.
ISODump - PlayStation ISO Content Extraction Tool, by LameGuy64.
MKPSXISO - An ISO Image Maker made specifically for PlayStation Homebrew Development, by LameGuy64.
PSXImager - Tools for dumping and mastering PlayStation 1 ("PSX") CD-ROM images
Controller / Memory Card
ddread - Read PS1 or N64 memory cards using a dexdrive.
MemCARDuinoPlus - PS1 Memory Card Dumper With Arduino
PadTest - Gamepad Test application for Playstation 1
PlayStation 1 Reset Mod - PlayStation 1 Controller Combo Reset mod.
PS1CardLink - PlayStation 1 Memory Card reader/data transfer software
psx_mc_cli - Crossplatform cli utilities for working with PSX memory card files
psxmcr - dump data from a psx save file (raw or mcs)
psxmemcardmgr - PSX Memory Card Manager
PXfinder - A tool for Playstation 1 to retrieve screen coordinates using a crosshair
https://github.com/JonathanDotCel/NOTPSXSerial - Serial transfer suite for Playstation 1 / Unirom
PSn00b-Debugger - An Open source debugging utility for the Original PlayStation, by LameGuy64.
LiteLoad - A fairly light weight serial loader for the PlayStation, by LameGuy64
Mcomms - Serial uploader, monitor and SioFS host for PlayStation homebrew development, by LameGuy64.
SMX Tool - PlayStation RSD and SMX model data editing tool, by LameGuy64.
Siofs-PSX - SioFS client library for accessing files from a PC host on the Sony PlayStation, by LameGuy64.
PSX Blender RSD Plugin - A Blender Plug-in for Exporting Models in PlayStation SDK RSD Format, by LameGuy64.
Img2TIM - An Image to PlayStation TIM File Converter, by LameGuy64.
PSXNet - A simple library and client program to get the original PlayStation to connect to the internet, by LameGuy64.
PSXDev-VRAM Viewer - Playstation 1 Development - VRAM viewer for Orion_'s PsxLib, by David Asselineau.
https://github.com/danhans42/nxflash - NXFLASH Xplorer/Xplorer/AR/GS Flasher for Sony PlayStation
https://github.com/danhans42/sioload - Serial EXE Loader for Sony PlayStation
https://github.com/filipalac/240pTestSuite-PS1 - A homebrew video suite for playstation 1
https://github.com/ArthCarvalho/img2tim - (Palette preservation, proper 4 bit support that works with most modern software such as Aseprite and others that can't export 4bit bmps)
https://github.com/romhack/PsxVram-SDL - PSX VRAM Viewer
https://github.com/Lameguy64/psxnet - A simple library and client program to get the original PlayStation to connect to the internet.
https://github.com/XaviDCR92/OpenSend - PSX application to upload PSX-EXE dinamically.
https://github.com/gwald/Yarexe - converts Net Yaroze ecoff and siocon's script to a psx.exe
https://github.com/paulsapps/ukcom - A PSX USB comms link
https://github.com/dezgeg/VdfViewer - PSX VDF (Vertex Difference Format) animation viewer
https://github.com/dx4m/x-flash-psx-toolset - X-Flash Toolset to check, generate, pack and unpack a ROMFILE.DAT for the X-Flash eeprom flashing software.
https://github.com/CodeAsm/PS1Linux - Linux for the original sony playstation one.
https://github.com/ChenThread/fromage - PlayStation 1 voxel engine
https://github.com/loveemu/seq2mid - Playstation 1 SEQ to MIDI converter, and its variants
https://github.com/ColdSauce/Taco-Browser - Internet Browser for the Playstation 1
https://github.com/ShendoXT/biosdumper - PlayStation 1 bios dumping tool
https://github.com/ArthCarvalho/PSX-LZ77 - An assembly optimized LZ77 decompressor for the PlayStation 1.
https://github.com/XaviDCR92/rspsxserial - A command line application which enables serial communications against a PlayStation 1
https://github.com/ABelliqueux/blender_io_export_psx_mesh - Blender <=2.79b plugin to export meshes in a scene to a custom .c file
https://github.com/gmarkall/psx-toolchain - PSX toolchain building scripts
https://github.com/YusufCelik/newroze - A PSX Debugger with a GDB server
https://github.com/Joy-Division/tools-mgs - Tools for working with files from Metal Gear Solid
https://github.com/CTR-tools/CTR-tools - a C# framework and a set of tools to parse files found in the original kart racing game by Naughty Dog.
https://github.com/dezgeg/crash-bandicoot-password-cracking - Reverse engineering the Crash Bandicoot password generation algorithm
https://github.com/cbhacks/CrashEdit - Unofficial Crash Bandicoot 1/2/3 Level Editor