Downloading OptOpt 1.1 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this free software for Mac is Jian Hu. 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 software belongs to System Tools.
From the developer:
OptOpt lets you switch or launch applications fast and with less key strokes. The default action to bring the switcher is by double-tapping the option key. As a result, the program will display the icons of specific apps in a row, so that you can open the desired application on the spot.
You may want to check out more software for Mac, such as Running Applications, AlphaTrack Manager or WinFSCleanser, which might be related to OptOpt.