jwma is a Web mail implementation based on the JSP Model 2 architecture. It builds on standard Java APIs (Java Mail API, Java Server Pages, and Java Servlet API) and relies on some available open source technologies (Xerces, Castor, Jakarta-ORO). jwma is designed and implemented for use with an IMAP server. It allows complete control over the store (creating, deleting, and moving folders, mailboxes, and messages). It supports MIME messages, supports text/plain message processing (e.g. making plaintext URLs "clickable"), and supports automatic sent & read mail archiving. It features a trash mailbox, includes a small addressbook, allows simple configuration of its features, and can be used in parallel with other mail clients (like Pine or Eudora).
MUMail is a Java applet designed to let you read your mail from a web page. It enables you to check your mail when there is no mail reader available, or if you don't want to change the configuration of someone else's mail reader. All you need is a Java 1.1 compliant Web browser. MUMail uses POP3 to download mail and is MIME enabled.
OBM is a groupware, email, LDAP, Windows PDC, CRM, and project management application. It is mainly used as a mail server, as an LDAP directory, as a Windows PDC, as a contact and customer database, as a project management tool, or as any combination of these functions. It supports internationalization and themes.
Saké Mail is a very high performance Web-based email system, designed for scaling to large numbers of concurrent users. It takes advantage of the Java Servlet API's memory-resident architecture and multi-threading HTTP response model. It avoids file system accesses through memory caching at every possible point, and never needs to touch the file system at runtime at all if coupled with an IMAP server. It supports POP3, IMAP, and SMTP, including authenticated SMTP. It also provides an extremely sophisticated message rendering system that can easily handle even complex HTML encoded messages with attachments that have been forwarded multiple times.