Looking for a program that can record select blocks from different coins

[DynamicDK]

Does anyone know of a program available that can either:

Work with different coin wallets to pull only recent blocks.  For something like Bitcoin, the blocks from the current difficulty, and the 2016 from the previous difficulty, would be all I would need.  That alone would not be difficult to do, but I need something that is easily adaptable to other coins.  Ones using a gravity well, or other method of quickly changing difficulty, would still need a sample size of the last few thousand blocks.

Or, a program that does not work with a wallet in any way, but could easily be adjusted, or modified, to achieve these goals, without needing to be completely rewritten for each coin.

I know there are a few websites that will provide this functionality, but I do not want to rely on a 3rd party.

[DynamicDK]

Even one that can do this for only Bitcoin, or only some other currency, would be helpful.