I'm looking for a product that ideally can be secured to a board and accepts a line or cord
and puts tension on that line or cord.

So instance you have a cord/line attached to something above the ground/floor/table and you want to secure that cord/line to the ground/floor/table and then put tension on that cord/line.

You can buy something like a tent guyline tensioner but that tensioner is attached/secured to the line and not the ground.

Does anything like this exist?

a lot more detail really
we need to know the strain size off cables directional pull if you are hoping to move it or the weight to act as an anchor ??
if you tell us the use you want to put it to we may be able to help

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we are all ------------------still learning

Working in Transport, I'm thinking, Ratchet Straps. The sort of thing that holds loads on lorries, or doesn't.

Here

Just be aware that there are two types. Restraining Straps, & Ratchet Straps which will provide a 'pulling force', as opposed to simply 'restraining' what's already there.

Is this what you're after?

http://www.tecni-cable.co.uk/Products/T ... ing-Screws

I bought a couple at B&Q recently.

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By eck! ©