The Stackexchange software works badly for polls and lists of things. As your question is asked right now people are just going to provide links to various products. This will not be very useful. It doesn't encourage people to add any useful information, that isn't already documented elsewhere.
In stead of asking for a list of things, you should see if you can modify your question to ask, how do I evaluate the list of things.
A question like 'I am currently looking for content filtering software, what features and functionality should I be looking for for when I evaluate the various solutions.' is more likely to be left open, and will probably be just as useful when combined with the lists you can get from Wikipedia, and search engine results.
Here is an example for switchesexample for switches. The 'what features/how do you evaluate' style question still will result in a fair amount of answers, but they will be more useful in the long term, and will not encourage vendors, to spam the site recommending their products.