going to start posting some mof my favorites that are free and thta i have actully used so i know they are worht there weight. the first one is from digital fish phones, called the fish fillets. the best of the catch is block fish with this and the free camel audio compresser you can cover just about any need you have with these single band compressers. block fish is a versatile compressor with countless ways to shape the incoming audio. Unlike many other digital compressors, blockfish has soul with the tube and air controls you can tune in on a frequency and really make it shine.
the next one is spit fish it is mainly for when your recording vocals and the singer is popping the mic too hard
spitfish is a dead-easy to use de-esser, aimed mainly at mono or stereo vocal tracks. Just like classic analog de-essers, this unit dynamically filters out harsh, annoying s-like sounds that would otherwise 'spit' in your face. i have used this on serval sessions and can say i am very pleased with it. if you are doing vocal tracks i highly recommend you give it a try.
the other one is super great for drum tracks adn gettign that pumping sound on vocals and compressed instruments. floor fish is a simple expander / gate device, easy to set up and offers a broad variety of processing, ranging from slight expansion, backgound noise attenuation to extreme gating effects.
What's different from similar units is the ability to scan the source and adjust the transistion curve accordingly.
i like to heavy compress drums and distort them then use this to gate it to your just gettgin traces of the sound really makes the drums stand out without the noise level and feedback drowning out the rest of your tracks.
give them a try