Apple Inc
– an American multinational technology company, that designs, develops, and sells consumer electronics, computer software, and online services.
Microsoft
– an American multinational technology company. It develops, manufactures, licenses, supports, and sells computer software, consumer electronics, personal computers, and related services.
Ericsson
– a Swedish multinational networking and telecommunications company.
Cisco Systems
– an American multinational technology conglomerate. Cisco develops, manufactures and sells networking hardware, telecommunications equipment and other high-technology services and products.