Open in AppCenter
You can view and install this app from AppCenter on elementary OS, or you can preview the listing here.
With Litteris you can organize your penpal contacts in a simple manner and keep track of your letters and postcards exchange.
You can star your most frequent friends and search for that one you haven't talked much lately.
Get Litteris and more on elementary AppCenter, the open, pay-what-you-want app store for indie developers. Every app is open source and has been reviewed and curated by elementary to ensure a native, privacy-respecting, and secure experience.