I recently got reminded about AdventOfCode2018. Be sure to check it out before end of december. Till now i did the challenges in rust, perl, bash - no specific language - just depending on the time i have. If you have plenty of time, the challenges from the last years are still available.
As another side project i am currently trying to convert a letter into computer readable text just from a scanned image.
The official Harpoon website is now online and available at https://harpoon.0x17.de/. You can follow the project on the blog, github or via rss with the following urls:
Harpoon is a flexible chat client for common protocols - written in C++ - and will stay online when you aren’t. You will get push notifications for private messages when you are on the run.