GMIC 1.5.0.8 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. GMIC lies within Photo & Graphics Tools, more precisely Viewers & Editors. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The actual developer of the free software is Partha Bagchi.
From the developer:
G'MIC has been made available as an easy-to-use plug-in for GIMP. It extends this retouching software capabilities by offering a large number of pre-defined image filters and effects. Of course, the plug-in is highly customizable and it is possible to add your custom G'MIC-written filters in it.
You may want to check out more software, such as Montagne, ImageVisu or AbsoluteDeNoiserFree, which might be related to GMIC.