StrongSoft has released SS-PEQ6, a 6 band parametric EQ plugin with comprehensive metering and spectrum analyser.
SS-PEQ6 is currently available for macOS as AU and VST3 plugins (AUV3, AAX and Windows and iOS versions on the way).
A special intro price of under £10 is available for a short time. This price will include all other versions of the plugin when they become available.
A demo version is available (emits beeps at regular intervals).