I'll reply to your questions in order:
1. I'm unaware of any such products, you'd probably have to combine
multiple programs and libraries or roll your own.
2. Same thing. I don't think there are specific telco meetings but you
are welcome to go to OS GIS meetings and discuss
2nd Meeting of Free Software for GIS (SASIG) - Évora, Portugal - 2 to 4
The II SASIG intends to present case studies of Free Software for GIS's
implementation in Public Administration,