ILOG, a Mountain View-based provider of supply chain management software, said today that it is in an agreement to acquire Chicago-based LogicTools. The deal is worth approximately $15M, in a combination of cash and stock. LogicTools is a provider of supply chain planning software. The acquisition is expected to close in April. ILOG will offer all of LogicTools' employees with positions, and will gain R&D sites in Eugene, Oregon and Chicago.