Hi John Morris
Lozad and mPDF are the two main must haves i agree, but have a go at
tikiwiki/diagram which is draw.io in a wiki plugin. Also
npm-asset/pdfjs-dist-viewer-min is good if you use a lot of PDFs (and have users in cranky old browsers that don't display them properly ;)
There are quite a few new ones that i haven't tried yet,
tikiwiki/tiki-manager looks really exciting (manage and update your tiki instances from within tiki, tiki 25+), must try
npm-asset/recordrtc some time, and
bower-asset/wodo.texteditor looks like it could be useful too.