Build any kind of product association. Promote not only same category or accessories but anything you like. Leverage your sales!
Now OpenSource, provides some help within the BackOffice: clear caches (smarty, template and classes_index) switch interface language (usefull to guide/train an employee using a different one) regenerate .htaccess (pruned off in 1.5) As you can see it is missing or removed features. Compatible since Prestashop version 220.127.116.11.
Manage events, link them with catalog items ( products, categories, ...). Inform your customers about those events.
TagCustomer is a little addons that gives you control over customer's group membership directly on the Order view (Back-office). Immediatly tag a customer as VIP or as scammer. You can view and manage the groups at will.
Inform you customer about the delivery date regarding their orders. Specify different delays. This module is in charge to compute a real date by using perpetual calendars to skip closed/non-working days Each product can be configured with its own delays (manufacturing, replenishing and origin). Each carrier hold its own delay and calendar.
Imagine you could add a tare weight to your customers' order based on the content. By content we mean a weight limit or a more complex scenario. Now orders reflect the true weight when preparing the shipment.