Ravec:  a 3D evidence grid library, with uniform array and octree backends.

FUSE for Google Drive: also includes a simple rsync-like tool.

Passe-partout: an implementation of transferable virtual property using the bitcoin blockchain.

An article by David Burch on refraction in celestial navigation.

Coyote Point Geology and History: an incomplete study of Coyote Point.

The Painting Behind the Bouquet of Flowers 1898.

[background photo:  54 images captured by QuickCam Pro 4000 in prime focus of 12" Meade Lightbridge, stitched with Hugin, light cloud conditions]