LW.Org offers public instant messaging and mail services.
You can register an IM/Mail account directly in band using your favorite client (that supports xmpp) or through this website, after via lightwitch.org you'll be able to chat with anyone who is using any federating server on the xmpp network.
This service has a protocol score by the Conversations tester of:
lightwitch.org *im* service is running on Metronome IM an opensource lightweight xmpp server written in Lua based on Prosody, compliant with latest XMPP RFCs (6120-6121)
- Supports a wide amount of extensions, including: Multi-User Chat (MUC), Stream Management, BOSH, Client State Indication (CSI), WebSockets, MAM, HTTP File Upload etc
- Extensive Microblogging using PubSub
- Allows sharing of large files, upto 1GiB, via the server's upload service
- Advanced anti-spam protection, which effectively filters all current instant messaging spam methods
- Registering grants you also a free mail account so you can use your lightwitch.org address to send and receive e-mails
Both developing the software and mantaining the serving infrastructure costs a fair amount of money and personal effort.
If you use this service and like it please consider making a donation via PayPal.