One of REAPER's greatest assets is its creative, helpful, and engaged user community.
That community includes talented developers of plug-ins and extension code.
REAPER users have created literally thousands of JS audio and MIDI plugins,
many of which are included with the REAPER installer, and many more of which
can be found in the REAPER user forum
or on various
user web sites. These plug-ins require no installation: simply copy the plain text
file containing the JS script into your REAPER/Effects directory.
Third-party developers have also created interesting and useful REAPER extensions.
These add-ons integrate directly into REAPER, to provide new custom features and
actions that are just as accessible as any built-in REAPER functionality.
Users have also created hundreds of graphics themes for REAPER,
to suit almost any taste: bright, dark, sober, garish, shiny and professional,
rough and ready. There are themes that are tasteful and restrained, and
themes that should probably be illegal. You can copy as many as you like
to the REAPER themes folder, and switch between themes by clicking a menu.