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Altera Quartus
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annoyance is having to re-request a license every so often. Usually happens when you don't have net access and sometimes can take a few days to get a new one.
Tools quite good. If you started with xilinx can take bit to get used to. Maybe a bit less buggy than xilinx tools in my experiance. (don't crash as often on my machine or ones I have to help support)
Altera have a fpga with an arm core.
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Alex