Gopher2600 v0.23.0 is released. Gopher2600 is an emulator for the Atari 2600. Whilst the performance is not as efficient as some other emulators it is none-the-less suitable for playing games, on a reasonably modern computer, at the required 60fps. (The development machine for Gopher2600 has been an i3-3225, dating from around 2012.)

Gopher2600 v0.23.0 changelog:
playmode
improved rendering stability
applies when monitor is similar in refresh rate to emulated TV
opengl VSYNC "immediate updates" will synchronise with timer
this may improve performance on some systems
improved sharpen shader, removing ugly graphical artefacts
artefacts were particularly noticeable in games with flicker kernels
screenshots
added new composite screenshot mode
composite is very good at capturing motion on the screen
activated with CTRL-F12
other screenshot modes renamed to 'single' and 'motion'
activated with F12 and SHIFT-F12 respectively
cartridges
added SCABS bank switching method
ROM select window
thumbnailer shows a smoother image
plusrom
fixed issue with rewind "boundaries" being inserted too often
reading from the network queue would insert a boundary
a boundary is only needed when data is sent to the network
bug fixes
using right mouse button to capture mouse for paddle input no longer
interferes with context menus for any open windows

Download: Gopher2600 v0.23.0
Source:Here