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How I ended up writing a new real-time kernel
Unit-testing (embedded) C applications with Ceedling: let's write C code that doesn't suck
Object-oriented techniques in C: my experience on the topic, plus an utility for autogeneration of boilerplate code
Visualizing the Heap on Embedded Devices, and getting highly efficient heap manager for memory-constrained devices
TNeo RTOS: well-formed and carefully tested real-time kernel for 16- and 32-bit MCUs
Bmp writer: C module for painless generation of bmp screenshots (mainly for embedded usage)
DFTrig: C module for calculation of trigonometric functions by lookup table, table generator included.
Indent with tabs, align with spaces

Bot Terminal: a crossplatform utility that performs binary data exchange via serial port. It allows one to set up flexible rules about how to reply to various requests.

Let's Run Lisp on a Microcontroller (this one is not at all practical, just for fun)

Vim: convenient code navigation for your projects: thorough explanation of advanced Indexer + Vimprj usage
Vim-Indexer: plugin for Vim that provides painless transparent tags generation
Vimprj: plugin for Vim that helps you manage options for multiple projects
Quit another window: plugin for Vim that helps you close arbitrary window without bothering to leave the current one

My Udev Notify: little bash script that shows notifications when any USB device is plugged/unplugged
Fuzzy bookmarks for your shell: very efficient and convenient way to keep a list of frequently accessed directories from shell