Just found out today, after a week of tests and six weeks of feeling gradually worse. I'll try to answer your questions. I'm on my phone.

Don't really know Pieter.

But zmq really played a important role in my life. I was burned out with programming two years ago and took a long extended break. Then in the depth of my lull, I took a look at zmq and really took to its minimalism and the do-it-yourself philosophy.

I really liked reading the documentation too. Actually it is the most memorable experience, my interpretation was that the zmq User Guide ("Zen of Zero") has a particular attitude: that everything has a singular focused purpose, yet it is also unpretentious, knowing full well the limitations of its circumstances and limited scope; and once a particular role has been decided for a particular situation, one should try do one job simply and well and get out of the way of others.

Perhaps this attitude is already expressed well in philosophy books. But for me, it was applied and ingrained in grokking zmq and coding with it. I could go on and talk about building a zmq demo helped me in getting my next job or created a Github repo on an zmq adaptor for protobuf. But just technical details behind the "Zen of Zero".

Pieter, I spoke with you back in 2013 at CodeMesh, about OSS development. I remember asking "if you default to merging PRs even if you don't agree with the, how can you assure quality control". And IIRC your answer was something along the lines of : "Why should I assume that I have the only answer for what quality is".

The frank humility of that answer has stuck with me over the years. And that simple 15min conversation has resulted in hours of contemplation. So thank you for making me think.

About 6 months after working as the sole developer on a large, multi-threaded project I came across ZeroMQ. In my work, I ended up using message passing as the primary communication between threads and unknowingly (and poorly in many cases) re-invented various message-passing mechanisms. After going through The Guide, I wished that I had known about ZeroMQ earlier! It would have provided a much better infrastructure for my work. I was reassigned to some other projects, but whenever I am given a chance (i.e. when I'm working on a full-Linux environment instead of in a microcontroller) I try to use ZeroMQ for multi-threaded communication. It is truly a pleasure, and I thank you for that.

There are several people whom I have been following and consider to be my "embedded systems heroes", and you are one of them. I am so sorry for your diagnosis.

It may not give much consolation, but perhaps there is a blessing in being given a chance to say good bye.

I'm not sure how much it will mean, but I will be keeping you in my prayers.

Pieter, I am so sorry to hear about this. Not sure if you need it, but I (and maybe others) would like to offer some money to help your family. It's not unheard of for people at your age to have debt, etc. Anyway to set this up?

I cannot begin to say how much I love your work. Thank you!

"The Guide" was one of my favorite ever rainy day reading experiences, irrevocably changed my approach to my work. I'm sure I join with others in saying thanks so much for your generosity and what you continue to bring to us all.

I've been thinking about this as of late and I was wondering if you have a plan for keeping your blog up and running even after you are gone? It'd be a shame to lose all of the valuable insights you have provided. Also, is there anything else that wish to share?

I've always thought that were my time to come, I'd want some way to pass on any last bit of valuable knowledge to those who come after me.

Just wanted to thank you Pieter - 0mq is an amazing piece of engineering (that BTW, we are merging in our TASTE work at my section of the European Space Agency). I didn't have the pleasure of meeting you face to face - but I have seen your work, and you are leaving behind a magnificent creation... you definitely made a mark on our world. Thank you!

I'm sorry to hear this, Pieter. I don't have a question, but would just like to wish you well - as much as possible under the circumstances.

Pieter inspired me to explore the "0" in other things through the success of the simplicity of 0mq and what it brought to my work. Things are simpler and easier for me, thanks to Pieter. I hope everyone gets to see the beauty and power of minimalistic approaches. I'm humbled to know him.

Lost for words on your diagnosis. I hope and pray, for you and your family, that you will squeeze as much out of the short time left.

I'm not lost for words on your contribution to open source, how we think about systems, and the great legacy of building blocks you've left for the rest of us to carry on building with. Your work and writing was like a sledge hammer to the way I thought about systems. After I was exposed to the ZMQ Guide and years of building systems with ZMQ, I saw the problems and their solutions in a very different way. Thank you for being that hammer - I owe you and am sad that I won't get the chance to say thank you/buy that beer in person.

I always think that as long as my children, and their children etc. live then there is a part of me that will never die. I think that if I ever produced anything that had near the impact of ZMQ, then I would include that in the list of things that told the world that I was here after I am gone.

The only question I have for you is, what made you realise that an open source approach was the way forward for your work?

All the best Pieter, and thanks for all that you will leave behind - especially the community.

Thank you Pieter for your work! Also, I wanted to thank you for your great and inspiring talk at Euro SciPy 2015 in Cambridge!

Thank you, Pieter, for making your ideas public. I learned many valuable lessons from your designs, all the way back to Libero and the SFL. Your generosity is greatly appreciated.

I've thought a while ago about what would I do in a similar situation, besides you know - the common idea of spending more time with the loved ones, and I would probably write a memoir, maybe a book even, and leave it to descendants or to whomever will ever hear my name. I like to think that the mark people like you left on human development would warrant future interest.

Sorry to hear about the sad news. It's the kind that usually leaves one speechless.

Man, sorry to hear about your troubles. Zmq was a refreshingly new idea in a sea of otherwise cookie cutter message passing frameworks. Take some quick selfie videos wishing your kids happy birthday, congratulations on graduation, wise wedding words of advice, and general parental guidance. You'll live on for decades through your children, and they'll love you more getting to see you at choice moments in their life. Peace be with you.

I got to know zmq while doing my master thesis, I got interested in the way zmq makes complicated stuff simple. I followed the track and read a couple of your books and articles, learned about C4.1 and whole the community. I liked the way you welcome new comers and your quick replies. One feels close without even knowing you much.

The net is a better place with people like you.

Funny, I read Culture and Empire before I got to use ZeroMQ at work. Small world. For what it's worth - all but nothing, I guess - I am sorry you are ill.

I loved the book. Thank you for your contributions to the world by writing it, and your contributions to open source. I'm sorry I never got the chance to meet you.

Damn. Damn, I'm sorry. Your work is excellent and you will be remembered for it, wish I could say the same.

Now go have some fun.

I'm shocked. What's the prognosis? I must say you are a great inspiration for making stuff that's become so complex simple again. We really need that in a world full of people who understand less and are being abstracted away. I was/am really looking forward to a zmq hackathon again.

Your writings are always inspiring. May I suggest a book for the boring hours? Good luck!

http://www.amazon.com/Meditations-New-Translation-Modern-Lib...

Maybe an odd, somewhat morbid question, but I dare to ask: what is to become of your digital legacy - your websites, trademarks, contributions, entitlements, books, twitter/facebook account, etc ... ? Have you given this any thought?

Pieter,

I didn't know who you were before today, but I now know you are a badass sir. Had a very close friend last year diagnosed with same disease / prognosis. My heart goes out to your and your family.

All the best.

You may say goodbye but you'll never be gone.

Many thanks for sharing your ideas and views on the world, they have planted a seed in many a mind. Your influence is far greater than many could imagine.

I'm so sorry. Like many others, I'd like to thank you for your ideas, passion and generosity. The world is a better place because of you.

ZeroMQ and its descendants will outlive us all. Pieter, you should be proud to have achieved so much.