All Things LADSPA (with some VST/VSTi)...

• LADSPA Home the central site for information regarding the Linux Audio Developers Simple Plugin API, maintained by Richard W. E. Furse; also home to the CMT computer musician's toolkit collection of plugins
• Audio::LADSPA Perl extensions for hosting LADSPA plugins
• BLOP Plugins band-limited oscillator LADSPA plugins from Mike Rawes
• CAPS Plugins the C* Audio Plugin Suite from Tim Goetze, a collection of LADSPA plugins for amplifier emulation, effects processing, reverb, EQ and many other functions
• Demolition is "a destruction testing tool for LADSPA plugins"
• DLADSPA "distributed LADSPA", groups several in a chain to create a single meta-plugin, from Nelson Posse Lago
• FIL Plugins more excellent LADSPA plugins from Fons Adriaensen
• Jezabel "a collection of LADSPA plugins designed to be used as building blocks for GUI or text-based audio applications under Linux"
• LCP Perl from David Riley, scripts for controlling LADSPA plugins via text-mode or graphic interfaces
• Lemux "a collection of LADSPA instruments based on devices from the openMSX emulator and other sources"
• LADSPA Plugins Moog filter, chorus, reverb, and more from Fons Adriaensen
• NJL Plugins LADSPA goodness from Nick Lamb
• SooperLooper excellent looping sampler LADSPA plugin from Jesse Chappell
• Soundtank Jacob Robbins' LADSPA host designed for making and playing softsynths
• SWH Plugins the must-have set from Steve Harris
• TAP Plugins Tom's Audio Plugins, a set of LADSPA plugins from Tom Szilagyi
• VLevel a "look-ahead" dynamics compressor, available as a command-line app and a LADSPA plugin
• VSTserver Kjetil Matheussen's remarkable server for running VST plugins under Linux, FreeBSD, i386 Solaris, and others (requires WINE); this site also serves up Kjetil's vsti dedicated VSTi server, the LADSPA/VST host, and his k_vst~ object for Pd
• VST/VSTi Plugins For Linux Database a community service project from Tim Orford
• XMMS-LADSPA a plugin to host plugins, from Nick Lamb
• jack_fst a JACK client for running VST/VSTi plugins
• kalsatools utilities from Dr. Matthias Nagorni
• ladspapluginmaker GUI for creating LADSPA-compatible audio plug-ins, from the makers of GDAM
• ladspar "a Ruby module for using LADSPA plugins", from Hans Fugal
• libfst in-process VST/VSTi support from Torben Hohn and Paul Davis
• liblrdf Steve Harris's "...library for handling RDF descriptions of LADSPA (and potentially other format) plugins"
• q2ladspa partial implementation of a set of plugins based on Quasimodo