OpenRGB

OpenRGB screenshots

It helps handling color information in a professional and reliable way
OpenRGB 2.2 : Main Interface

Alternative downloads

Radiant Imaging Color Calculator
2.0
FREE
Rating
Radiant Imaging developed a free Color Calculator program.
Aqua Calculator
6.0
Rating
Lets you manage numerous data of your tank, targeted values, technique, etc.
Hexacolor
3.0
Rating
Hexacolor provides conversion of color between decimal and hexadecimal values.