MIA Laboratories freebies:
MIA Fat - Maximises low frequencies in a friendly way to the new generation of sound systems.
MIA Muscle - Increases perceived loudness and presence without compression.
MIA Thin - Lift up that track and give it some ethereal essence.
Border - Second order Butterworth Low-Pass, High-Pass filter combination. Smooth response and analogue character.
Welcome to the Coffee House.
Some of those lists already exist in the Instruments & Effects forum:
https://discuss.cakewalk.com/index.php?/topic/5229-freeware-instruments-thread/
https://discuss.cakewalk.com/index.php?/topic/5064-favorite-freeware-fx-thread/
https://discuss.cakewalk.com/index.php?/topic/10497-a-collection-of-free-kontakt-instruments/