Please also have a look at the gateway boxes from berofix (http://wiki.beronet.com/index.php/Main_Page). I am not affiliated but have used different products from them over last few yeas and all have survived and are stable.
Documentation is open and free on their wiki. They provide updates. They are not the cheapest but they have different vendors and they are sold in online webshops. You can choose for the inside PCI(e) cards or their external boxes. Last few years I went for the external boxes. They can be fitted in a server rack or you mount them against the wall with screws. Regards, Michel.
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