Hello there,
we, draglet, are a company based in Munich, Germany, and also offer our unique exchange software as white label solution.
Our software features Optimistic Fund Locking (users are allowed to crreate orders that are actually not covered by current account balance) and a wallet with encrypted user access and multisignature cold storage. The solid order matcher was already tested for 9 months by thousands of users and now is one of the products that draglet are offering as part of our white label exchange. You can get more information about our software and services at draglet.com - feel free to give our exchange showcase a try.
Greetz,
Ben