SPARKS is now available on GitHub. A few tweaks and bug fixes have been made since the original post.
The repository is just the proof of concept and doesn't include any authentication or security (except for an example .htaccess file to stop unwanted access to the .txt files.)
Note I've opted not to add search to SPARKS as I feel it goes against the ethos of spark files. The idea is that you periodically read through your files to get inspiration from serendipitous discovery and those happy accidents – search would take you away from this.
