CING
From NMR Wiki
CING stands for: "Common Interface for NMR structure Generation" and is known for structure and NMR data validation. Pronounced 'king'.
Project site: home page, video tutorials
CING was used to create NRG-CING. iCing is a web interface to CING. The same human interface can be exploited programmatically using something like this robot.
The following figures illustrate some of the capabilities offered by CING.
Limitations: CING in 2008 does not yet do much validation on sugars.
Running time: depends on number of residues mostly, typically takes from 2 minutes to 1 hour on the iCing server.
Requirements: python with matplotlib and many optional external programs such as Procheck.