A lot of what I've written is proprietary and some is scattered around on my blog (which I'll try to collect later), but meanwhile...
I am a member of the editorial team and a contributor (not sole author!) for Mi Yodeya Publications. We've published four books so far, about Pesach (Passover), Chanukah, Purim, and the High Holy Days. You can download them at that link.
I am the co-author of Joy and Jealousy, a book of reconstructions of 15th-century Italian dances (balli). The book was published on paper in 1997 and later (mostly) posted online. The multi-part arrangements of the music weren't integrated into that posting but can be found in this larger collection.
I've written a bunch of posts for the Worldbuilding.SE blog, Universe Factory, from mid-2015 to present. Some are fiction, some are how-to or process articles, and some are commentary.
Process and commentary: