Startup or open source company

[acex]

i'm senior .net developer/architect with experience in isp/telecom/crm/cms/billing/network auditing/web apps/... looking for a good open source project or a good startup where i could give in my free time being unemployed at the moment. [e-mail] i should add i have non expert hands on experience with c/c++/python/django/ruby/rails/apache/mysql/linux