In addition to my blog on WordPress (this site) I maintain a huge math education site, featuring articles about teaching math and tons of curricular materials. You should definitely check it out. I will keep track of updates to the site on this page.
Summer Workshops: I set up that page to announce my 2019 summer workshops: Visual Algebra (grades 6-9), in two locations.
Soccer Angles: I added interactive GeoGebra applets to this page, which is an extension of the low-tech Lab with the same name in Geometry Labs.
Spirograph Simulation: For some reason, while the online applet worked, the GeoGebra file I included did not open when downloaded. I got some help on Twitter, and posted a corrected version.
Math Ed Consulting: minor tweaks.
Electronic Graphing: minor tweaks.
Pattern Blocks: I added a link to Jen Silverman’s GeoGebra pattern blocks applet.
I created a conic sections home page. (Links to the geometry of the parabola and ellipse, 2D and 3D, and more.)