KV
[Knape & Vogt] makes an adjustable shelf bracket for commercial use -- it combines with their 1" wall-mount slotted standard. But it only tips down at the front, not up. If the standards were built into the back side of posts mounted 12" +- away from the wall (floor to ceiling ?) the brackets would support shelves tipping down at the back -- 15 degrees is the first available position below horizontal.
This is probably not what you had in mind, but is the only system I am familiar with that might suit your need.
http://www.knapeandvogt.com/kv/Shelving/Wall+Mounted+Systems/Brackets/17...
.
It is conceivable that a free-standing system could be contrived using these brackets and standards: like other shelving systems from the past, it would involve inverted L-shaped frames which rest against the wall at the top and on the floor at the front, with the shelves cantilevered via the brackets back toward the wall. The issue there would be right/left stability ("shear") of the unit(s); at a minimum the short legs of the L's touching the wall at the top could be located via a wall-mounted cleat running horizontally between those legs. . .
If you need any help, please contact us at – info@designaddict.com