URL: http://web.expasy.org/protparam/
Current status:

Has been up since 25/4/12.
Embrace tests: not tested.
Description: Compute various physical and chemical parameters for a given protein sequence. The computed parameters include the molecular weight, theoretical pI (isoelectric point), amino acid composition, atomic composition, extinction coefficient, estimated half-life, instability index, aliphatic index and grand average of hydropathicity (GRAVY).