BigBlueButton is an quite interesting open source web conferencing system for on-line learning. BigBlueButton enables to share documents (PDF and any office document), webcams, chat, audio and sharing desktop. It can also record sessions for later playback.
It helps to deploy webinars or group conferences in small/medium businesses. It has quite intuitive web interface, so, minimize efforts to integrate the application into corporate infrastructure.
To simplify implementation BigBlueButton into companies IT systems I’ve finished developing BigBlueButton .NET (C#) SDK. It support almost all API functions of BigBlueButton except video recording (not tested yet). BigBlueButton .NET (C#) SDK supplied with test utility showing how to use SDK for developing. The utility screenshot at the picture. 
BigBlueButton .NET (C#) SDK could be downloaded here: BigBlueButtonSDK.
Please, inform me about bugs and recommendations to the e-mail: fedorov@bizkit.ru.
