While I am with you on open source. Unity uses lots of it to build on such as mono.net (C#, boo, javascript), OGG formats, some collada support and FBX support (autodesk), opengl (also directx), Cg formats for HLSL and GLSL shaders etc. I am betting you haven't tried it, if you do I am sure your opinion will change the pipeline and ability to create quality stuff with it is almost immediate. There is not just another product like it currently in terms of pipeline improvements, apis, ide, size of plugin, shader support etc for the web.
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While I am with you on open source. Unity uses lots of it to build on such as mono.net (C#, boo, javascript), OGG formats, some collada support and FBX support (autodesk), opengl (also directx), Cg formats for HLSL and GLSL shaders etc. I am betting you haven't tried it, if you do I am sure your opinion will change the pipeline and ability to create quality stuff with it is almost immediate. There is not just another product like it currently in terms of pipeline improvements, apis, ide, size of plugin, shader support etc for the web.