What started a short list became quite a big description, more details inside the post.
Sonic is a fast, lightweight and schema-less search backend. An alternative to Elasticsearch that runs on a few MBs of RAM.
QuickChart - free and opensource service to generate a chart image from URL
GoAccess.io - open source real-time web log analyzer and interactive viewer that runs in a terminal in *nix systems or through your browser.
NES.css cool new CSS faremowork, first for the long time :)
dive a tool for exploring a docker image, layer contents, and discovering ways to shrink your Docker image size.