Make something amazing, for anyone, at DrupalCon. Standard prices end on August 26.
This module adds a basic line item type to Drupal Commerce. This line item type should be used by admins to add arbitrary price amounts directly to orders without needing the use of products. e.g. Adding a payment order to a user account manually after the user paid in person. I could not find a similar project, but I might have missed one if it exists.
This module also updates the Commerce Line Item view to display the added amounts to the table.