Bitcoin Forum

Is there anything like Private Key Generator or  Private Key Finder exists in this world?????

generating private key is what all the bitcoin wallets do! in simple terms the process it is finding a number in a huge range of numbers and then convert that number to a user friendly formal called base58 formatting which means it will be a string starting with 5 or K or L.

private key finder, is nothing that can exist! you can not find private keys and the term may be used by some scammer trying to give you malware.

if you have something more specific in mind then clarify your question.

bitaddress.org , An open source javascript client side wallet generator for free.
You can generate multiple paper wallets in seconds, store the private key at safe place to avoid risk of being scammed.
Be carefull not to save your private keys in notepad as the data from notepad can be tracked by scammers easily.

Every Bitcoin client is (or at least should be) a random private key generator. If you are looking for a program, that only generates private/public keys look for Vanitygen.

There is a project called LBC (Large Bitcoin Collider) that does something similar.

Yes.
Not a meaningful one.  Large Bitcoin Collider is working towards it, but if a Bitcoin wallet randomises private key generation properly, the chance of that private key then being found is negligible.

If you want to understand how ridiculous the prospect of breaking 256-bit security is with current technology, look at this site (http://directory.io/) and try going to a high-numbered random page and see if there are funds in any of the addresses.  There aren't, because the number that are being used is almost none compared to the total number that there ever could be.