When writing a formal or business letter, presentation style and format is key to making a good first impression. These templates provide excellent examples of how to structure such a letter, and include sample content to act as a guide to layout.
Customizable formal letter template with a header.
It allow you to choose color theme, optional personal information (contact, picture, etc.) in header, and information with respect to:
English conventions (address and date at right and recipient information at left);
French conventions (address and date at left, and recipient information at right).
If you use the letter template for a cover letter, then you can find a CV template which match with it, look for Arthur-CV template on Overleaf or on the following GitHub link.
More details and source files are available on GitHub.
Basic template for German letters according to the DIN 5008 standard
It is building on scrlttr2, so everything should be pretty much self explaining.
For contributing, see https://github.com/ckuenzle/din5008-letter.