Hello my friend I would like to participate in the startup, I have developed in fermat.org a startup cryptocurrency, my gmail is hendryrodriguez1990@gmail.com

* Kimoto's Gravity Well
   - Auroracoin implementation (from MegaCoin)
   - Dash implementation (above plus handling of negative uint256 and parameter change)
   - Vulnerable to Timewarp Attack (has been carried out on an altcoin).
       timewarp attacks attempt to decrease the difficulty to then mine many coins fast, or with a 51% attack mine a new chain from the genesis block.

* Nite's Gravity Well
  - Implements fix for KGW Timewarp Attack.
  - I can't find any particular reference to the other changes notsofast refers to, and the AuroraCoin source doesn't even appear to use it (they changed     to a different calculation for a multi-PoW-algorithm setup AFAICT).

* DigiShield
   - DigiByte implementation of v3 (there are four versions, see above and below that function).
   - Designed to overcome the issues of the Kimoto Gravity Well algorithm in recovering from large multipool engagements.
   - Asymmetric (allows difficulty to decrease faster than it can increase) .
   - Possibly makes it vulnerable to timewarp attacks, but no proof yet.

* Dark Gravity Wave
   - Dash implementation
 - Combines multiple exponential and simple moving averages to smooth difficulty readjustments and mitigate against exploits in the Kimoto Gravity Well.

A better choose than kimoto function is the implementation of DigiShield , In summary DigiShield is a balanced asymmetrical approach to difficulty re-targeting. You don't want to let the difficulty go to high to fast, but you need to give it enough room to catch up quickly. The same thing goes with down swings, since it takes longer to discover new blocks you need to give it more room to go down, but not enough to send it to the floor.

The DigiShield code can be found here between lines 833 & 1007: https://github.com/digibyte/DigiByteProject/blob/master/src/main.cpp
Take a look at the Dogecoin difficulty chart: http://www.coinwarz.com/difficulty-charts/dogecoin-difficulty-chart.
You can see how multi-pools have really been mining most of the coins and leaving the dedicated Doge miners to pick up the slack and get the short end of the stick when it comes to new coins. You can also see when DigiShield took effect and that no longer occurs.