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I'm looking for a text editor AND project "browser", so designing sub block in one tool and handling the project in another is awkward...
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I was planning (organising) to: develop sub-modules using a VHDL-editor (of choice) and ModelSim (Altera Edition of course). The top-project I will build using Qsys. Of course doing everything from within one IDE would be nicer, alas ...
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I'd be very surprised to if an open source FPGA existed out there... :)
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No real surprise, FPGA engineers are not that much interested in SW development and have enough fun in their dayjob, so they don't need to start a hobby-project?