加拿大有哪些知名的IT公司？

Greo Products Inc .、ISM-BC Corp .、Seagate Software、Sierra Wireless Inc .、PMC-Sierra Inc .、Infowave Wireless Messaging Inc .、QLT光治疗公司、MacDonald Dettwiler and Associates、Prologic Corp .、Pivotal Corp .、intelligence Works Inc .、Glenayre、Angiotech pharma ceuticals Inc .、Benchmark Technologies Inc .、b . c . study Inc .和Electronic Arts (Canada) Inc .