Maëlle Salmon announced her “new session” (a cute newborn) on Twitter, and I was delighted and honored to see the knitr hex logo on her blanket. Welcome to the woRld, little Émile!

That reminded me of a few other joyful moments. Occasionally, I receive thank-you notes and gifts from users, such as this card in a package:

this note in a bookdown report:

and this picture in an email:

The instructor in the above picture ran into me in early 2015 when I was looking for the classroom at UConn to teach my tutorial, and took a selfie with me. I was surprised and touched to see he put this picture on the projector and took another picture with his students a couple of months later. That was very encouraging to me.
I also remember Scott Kostyshak kindly bought me a book as a gift a few years ago, which was the first physical gift I had received for any of my software packages. He discovered the link to my Amazon wish list, which was hidden deeply (which was intentional) somewhere in a GitHub repo at that time. I removed this link later since I found I didn’t really need more gifts. I don’t need donations, either.
This post is just to show some random memories of me as a software developer that have been motivating me to continue my work. Again, I’m not asking for thank-you notes or gifts or donations whatsoever. A knitr hex logo on your baby’s blanket can make me happy enough :)
P.S. Two months after I wrote this post, I was glad to learn that I was considered helpful by Alison.
Donate
As a freelancer (currently working as a contractor) and a dad of three kids, I truly appreciate your donation to support my writing and open-source software development! Your contribution helps me cope with financial uncertainty better, so I can spend more time on producing high-quality content and software. You can make a donation through methods below.
-
Venmo:
@yihui_xie, or Zelle:xie@yihui.name -
Paypal
-
If you have a Paypal account, you can follow the link https://paypal.me/YihuiXie or find me on Paypal via my email
xie@yihui.name. Please choose the payment type as “Family and Friends” (instead of “Goods and Services”) to avoid extra fees. -
If you don’t have Paypal, you may donate through this link via your debit or credit card. Paypal will charge a fee on my side.
-
-
Other ways:
WeChat Pay (微信支付:谢益辉) Alipay (支付宝:谢益辉) 

When sending money, please be sure to add a note “gift” or “donation” if possible, so it won’t be treated as my taxable income but a genuine gift. Needless to say, donation is completely voluntary and I appreciate any amount you can give.
Please feel free to email me if you prefer a different way to give. Thank you very much!
I’ll give back a significant portion of the donations to the open-source community and charities. For the record, I received about $30,000 in total (before tax) in 2024-25, and gave back about $15,000 (after tax).