Several websites are now essential viewing for all those interested in Anglo-Saxon charters. Amongst these are:

The Electronic Sawyer http://www.trin.cam.ac.uk/chartwww/eSawyer.99/eSawyer2.html Currently under revision by Rebecca Rushforth in Cambridge, which provides manuscript and bibliographic information on each charter.
The Prosopography of Anglo-Saxon England (PASE) http://www.pase.ac.uk/index.html PASE is now the largest collation of primary information ever assembled about the period.
Anglo-Saxons.net www.anglo-saxons.net Sean Miller's website contains, amongst other material, searchable full texts of all charters.
Kemble http://www.trin.cam.ac.uk/chartwww/charthome.html Simon Keynes' website provides access to an array of information and external sites as well as hosting the British Academy's Joint Committee on Anglo-Saxon Charters.
LangScape http://www.kcl.ac.uk/humanities/cch/langscape/ Joy Jenkyns' Langscape is one of the projects with which ASChart has interoperability.

The following institutions have been involved the ASChart:

Centre for Computing in the Humanities http://www.kcl.ac.uk/humanities/cch/
King's College London http://www.kcl.ac.uk
The British Academy http://www.britac.ac.uk/