The one coin that hasn't made the post yet that should is YACoin
http://yacoin.orgWhy is it unique?It was the first coin lauched to use scrypt-chacha and an increasing N-Factor - This is the litecoin of the scrypt-chacha world, where microcoin, ultracoin (et. al.) are the "me-too" clones like feathercoin and dogecoin. Additionally, YACoin implements the Hybrid POW/POS model established by Novacoin, with some additional work to attempt to prevent POS orphaning POW blocks. Lastly, the the block reward is variable, based on the coin difficulty. As the N-Factor for the POW algorithm increases, the network hashrate goes down by half (or more), so too does the difficulty. The maximum block reward is capped at 100 coins per block, and the current reward is ~44 YAC/block.
Where is it right now?YACoin was launched in May, 2013. It has seen a stable network since that time, and has had one hard fork to address the POS orphaning POW block problem. YACoin is currently at N-Factor 14 (N=32768, or 4 MB per calculation), and normalizing the network hashrate relative to N=1024, is over 100 MH/sec. The current network hashrate is considered high when you take into account the speed of the average GPU miner is under 2KH/sec. On the mining front, mining is not limited to high end, high wattage cards, and very respectable hashrates can be achieved by sub $100 GPU's that consume lass than 30 watts of power. There is active work ongoing for the Wallet, as well as AMD, nVidia, and CPU miners.
Where is it going?YACoin is the trailblazer of the N-Factor coins. It was the first to utilize an N of 2048 (doubling scrypt's memory requirement) in July 2013. On May 31st, 2014, YACoin will be the first and only coin being mined with an N-Factor of 15. As N increases, the difficulty in setting up a GPU miner becomes more difficult for the inexperienced. To that end, GPU mining software is being improved to make this process much more simplified, with the ideal goal of the software determining the best settings for the card. Along with the improvements to the GPU miner, the gap between CPU hashing and GPU hashing narrows, bringing the viability of CPU mining back into play. While no coin can claim long term immunity to ASIC's, the schedule of the NFactor increases is rapid enough that the financial viability of an ASIC targeted specifically at the coin should not be economically feasible.
Why should you add YACoinThere are so many alternative coins in existence today, so adding each and every coin is not a reasonable endeavor. YACoin has good technology, a proven track record, and a great wallet and mining software. What it really lacks is visibility and accessibility. Not everyone wants to be a coin miner, and this hurts the coin because it is only on two exchanges. YACoin could really benefit from a wider audience and more acceptance.