The 3.1 version of LGTM for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. LGTM for Mac belongs to Lifestyle Tools. We recommend checking the downloaded files with any free antivirus. This free Mac app is an intellectual property of Toshihiro Suzuki.
From the developer:
LGTM is a quick LGTM image picker for your Mac. LGTM stores up to 20 images in the background. You can save your favorite image by clicking on Star, or simply pressing Command + S. You can choose your favorite markdown style from the Preferences panel.
You may want to check out more Mac applications, such as SocialAddict, ATPM.com or Snow Globe, which might be similar to LGTM.