
PCSX2

PCSX2 is an open-source emulator using a combination of MIPS CPU Interpreters, Recompilers and a Virtual Machine through plugins to manage hardware states and PS2 system memory. It has been running for more than 10 years and can run over 2000 titles with many at full speed. 64-bit versions are being developed and tested, please check here.
It's a custom frontend for PCSX2 which removes the tedious task of tinkering the settings for each game or creating complicated setups for each.
This plugin uses sockets instead of Tap or WinPcap, which the author hopes will eliminate most configuration issues users face when setting up.
Last Stable Release:
07-05-2020
Dated:
1.6
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Windows: 8.1 (32-bit or 64-bit)
Linux: Ubuntu 18.04/Debian+, Arch or other distro, GNU/Linux (32-bit or 64-bit)
Mac: Not Updated in over 5 years
GPU: DirectX 10+ or OpenGL 3.x+

Play!
It's an experimental PS2 emulator with the goal of achieving the best accuracy. The current benefits are it doesn't need a BIOS since it's a high-level emulator, has easy configuration in regards to no custom settings to fix specific games and straight forward design.
Last Builds:
8b4cfa6 / 15-01-2021

DobieStation
DobieStation is an experimental open-source PS2 emulator which aims to be easy-to-use, fast, and accurate on PC while also providing an optimized Android port. A large portion of the PS2's library can boot or get to menus and some can even go in-game, but it isn't recommended for general use yet.
That said, it also requires a copy of the PS2 BIOS.
Last Builds:
0.0.1594 / 16-01-2021