Codabar See Wikipedia - Older standard that typically only represents numeric data, but can represent a few letters and symbols, but the standard doesn't represent non-numeric data in the body. Because Codabar is self-checking, most standards do not define a check digit.
 Code128 See for a good explanation (and Code set A - alphanumeric data with uppercase letters only and non-typeable control codes. Code set B - alphanumeric data with upper/lowercase letters, numeric, and punctuation. If a code set is not specified, the output will default to a Code set B output.
 Code39 wikipedia: Spec includes 43 characters, A through Z, 0 through 9, and special characters.
 Code93 See Code 93 is designed to encode 26 upper case letters, 10 digits and 7 special characters.
 Ean See Wikipedia Superset of the UPC 12 digit system created in Europe. Supports EAN-13 and EAN-8.
 Int25 Interleaved 2 of 5.
 Msi Modified Plessey ("MSI"); see Numeric only, very simple barcode. This implementation does generate the optional check digit.
 Upc Universal Product Code; see See and for notes on conversion of UPC-A to UPC-E. UPC-A is a 12 digit numerical system (11 with a check).