Download of Let.ter 1.0 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. The actual developer of this software for Mac is Mutahhir Ali Hayat and Matthew Guay.
Let.ter.zip is the most common filename for this application's installer. The program lies within Communication Tools, more precisely E-mail. The latest version of the program can be installed on Mac OS X 10.9 or later. The following version: 1.0 is the most frequently downloaded one by the program users. We recommend checking the downloaded files with any free antivirus.
From the developer:
Let.ter is a tiny Markdown powered app just for writing emails. The app is a new approach to email, one that lets you focus on your message without the distractions of your email inbox. No notifications, no inbox zero to achieve, no folders and tags and complexities.
You may want to check out more software for Mac, such as TCF Emprunt or Navigium Lernsoftware Latein, which might be related to Let.ter.