| Creox | a JACK-friendly real-time sound processor | | | | | | |
| ELE | the "Excellent Low-latency Effects" processor | | | | | | |
| ExEf | Tom Olexa's cool "extreme effects" processor | | | | | | |
| GNUitar | guitar effects processing software from Max Rudensky | | | | | | |
| GTKgep | another neat guitar effects processor, requires Gtk | | | | | | |
| Guitar FX Processor | software from Marin Vlah | | | | | | |
| Jesusonic | "God's own effects processor", it must be good... | | | | | | |
| Lack Of Invention | a realtime signal processor based on LADSPA plugins | | | | | | |
| Linux Realtime Effect Processor | LADSPA-based fx, aimed at embedded systems | | | | | | |
| StompBoxes | guitar fx processor with Gtk interface | | | | | | |
| Tapiir | Multi-tap delay with FLTK GUI, from Maarten de Boer | | | | | | |
| Ultra Power Effects Max II | a realtime processor for full-duplex soundcards | | | | | | |
| arcangel | distortion effect, requires JACK, from James Shuttleworth | | | | | | |
| ecamegapedal | Kai Vehmanen's great virtual guitar-fxstudio effect box | | | | | | |
| guitarix | rock guitar effects | | | | | | |
