Bill Gates wrote on his Blog:

I’m truly saddened to learn of Steve Jobs’ death. Melinda and I extend our sincere condolences to his family and friends, and to everyone Steve has touched through his work. Steve and I first met nearly 30 years ago, and have been colleagues, competitors and friends over the course of more than half our lives. The world rarely sees someone who has had the profound impact Steve has had, the effects of which will be felt for many generations to come. For those of us lucky enough to get to work with him, it’s been an insanely great honor. I will miss Steve immensely.

Google co-founder Sergey Brin:

From the earliest days of Google, whenever Larry and I sought inspiration for vision and leadership, we needed to look no farther than Cupertino. Steve, your passion for excellence is felt by anyone who has ever touched an Apple product (including the macbook I am writing this on right now). And I have witnessed it in person the few times we have met. On behalf of all of us at Google and more broadly in technology, you will be missed very much. My condolences to family, friends, and colleagues at Apple.

Larry Page, Google co-founder:

I am very, very sad to hear the news about Steve. He was a great man with incredible achievements and amazing brilliance. He always seemed to be able to say in very few words what you actually should have been thinking before you thought it. His focus on the user experience above all else has always been an inspiration to me. He was very kind to reach out to me as I became CEO of Google and spend time offering his advice and knowledge even though he was not at all well. My thoughts and Google’s are with his family and the whole Apple family.

Google chairman Eric Schmidt:

Steve Jobs is the most successful CEO in the U.S. of the last 25 years. He uniquely combined an artists touch and an engineers vision to build an extraordinary company… one of the greatest American leaders in history.

Microsoft CEO Steve Ballmer:

I want to express my deepest condolences at the passing of Steve Jobs, one of the founders of our industry and a true visionary. My heart goes out to his family, everyone at Apple and everyone who has been touched by his work.

Microsoft co-founder Paul Allen:

My condolences to Steve Jobs family and friends. We’ve lost a unique tech pioneer and auteur who knew how to make amazingly great products.

Facebook co-founder Mark Zuckerberg:

Steve, thank you for being a mentor and a friend. Thanks for showing that what you build can change the world. I will miss you.

Dell founder Michael Dell:

Today the world lost a visionary leader, the technology industry lost an iconic legend and I lost a friend and fellow founder. The legacy of Steve Jobs will be remembered for generations to come. My thoughts and prayers go out to his family and to the Apple team.

BOB IGER, CEO OF WALT DISNEY CO:

Steve Jobs was a great friend as well as a trusted advisor. His legacy will extend far beyond the products he created or the businesses he built. It will be the millions of people he inspired, the lives he changed, and the culture he defined. Steve was such an 'original,' with a thoroughly creative, imaginative mind that defined an era. Despite all he accomplished, it feels like he was just getting started.

Former Yahoo CEO Carol Bartz:

It’s the ultimate sadness. First of all, it’s a young person who was revered, sometimes feared, but always revered. In a way, it’s kind of prophetic; everyone was hoping he could be on stage yesterday” during Apple’s iPhone announcement. "He was a very special person, and he didn’t get to where he was by having people like him all the time. He got to where he was because he had a vision and a purpose. It’s easy to try and please everyone, but he kept to his principles.

Dick Costolo, Twitter CEO:

Once in a rare while, somebody comes along who doesnt just raise the bar, they create an entirely new standard of measurement.