StickyChat is an SLProxy application for Second Life. It initially started out as a small application aimed at making certain attributes of chat 'Sticky', such as Whisper, Shout, and even talking on other channels (and echoing what you say on silent channels back to you so you know what you said). By 'Sticky', I mean that the default chat is modified to have different attributes and these attributes stick so long as the features are enabled, basically auto-whisper/shout and such. It has since evolved to incorporate plugins with much more functionality.
Plugins:Filters:Filter various things, such as typing sounds/anims, screenshot sounds/anims, insta-sit (sit immediately instead of trying to find your way to seat), automatically accept/decline teleports, inventory, friendship offers.
Translate:Translate incoming and outgoing chat. Translation of IM's not yet implemented.
Friends:Quick implementation to allow for fooling your client to think all your friends are online (so you can offer them teleports easily and what not), fooling your client to think all your friends are offline, and querying SL about all your friends to fix all their statuses. Future plans here are to monitor your friends list, so you can know when people remove you.