Mbuni
- Provides an open source MMS gateway module for Kannel.
- http://www.mbuni.org/

Hellkvist
- Produces Mmslib which is a PHP library for encoding and decoding MMS.
- http://www.hellkvist.org/software/

Openwave Developer Network - Tools & SDK - MMSC
- Describes how to access its MMSC server for testing end-to-end delivery of MMS messages.
- http://developer.openwave.com/dvl/tools_and_sdk/test_servers/mmsc/

NowSMS Forum
- Although this is a forum for NowsSMS's product support, there are some very useful information here.
- http://www.nowsms.com/messages/

GSM World on MMS
- Articles on MMS.
- http://www.gsmworld.com/technology/mms/index.shtml

JVending
- J2ME MMS Client for Mobile Phone.
- http://sourceforge.net/projects/jvending