I do not know if it is for limited time or if they made it free for ever. Perfectly Clear is offering their Perfect Exposure software for free. Download it here. This is a powerful plug-in for Photoshop and Lightroom 6.
Perfect Exposure for Photoshop and Lightroom is the perfect tool for any photographer or designer. With eight great presets to solve the most common exposure problems, this fast, easy-to-use plug-in can bring out the details in any image, even dark photos. Spend less time editing and have more time behind your camera.