It is updated weekly. Allows keyword searching with several options. No human indexing, so keyword searching meets with variable success. Results do not include subscription information, but provide clickable links to obtain information about the list. Tile.net This directory includes discussion lists which use the Listserv software.
Results do include subscription information.
No human indexing. It allows both browsing and keyword searching. It includes all kinds of conferences, not just email discussion lists. A large, searchable collection of mailing list descriptions, currently maintained by Vivian Neou. Can be browsed, but not searched by keyword.