I am looking for a code snippet manager (or, more generally, a text snippet manager) that stores all of its data locally (i.e. not cloud-based).
It should be possible to organize code snippets by language/framework/technology (i.e. at least one "hard" level of categorization); anything beyond should be well usable for larger collections of code snippets (maybe by further hierarchical grouping, maybe by user-defined tags, ...). Code snippets must not be limited in length. Syntax-highlighting is a plus, but not absolutely necessary.
The application must run on Windows (although Windows/Linux cross-platform capabilities are a bonus), be gratis and open source, and usable with a GUI (i.e. not a purely text-based interface).
I am not looking for a code editor that also includes a code snippet manager. I am looking for a central tool to store snippets for use in other editors and IDEs.