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Mjollnircoin (MNR) is a HEFTY1-based crypto coin that is using the same algorithm like Heavycoin, though there is no reward voting support with MNR, so you will need a slightly modified miner in order to mine it even though the algorithm is the same as for HVC. We already have a ccminer update to support MNR for Nvidia GPUs and there is also a cgminer 3.7.3 with Mjollnircoin support available for AMD OpenCL mining (source). Do note that Nvidia is still faster in mining HEFTY1-based crypto coins such as Mjollnircoin (MNR). With the cgminer for MNR mining we are getting a bit over 16 MHS mining on a single Radeon R9 280X video card.
The ccMiner software miner for Nvidia GPUs has received an update to version 0.8 (source) adding support for Mjollnircoin (MNR) mining. This new coin has been just recently launched, and then again just relaunched with some glitches, but there is still some interest from users, so you might want to give it a try, especially if you have Nvidia-based GPUs for mining. We are currently getting about 25 MHS with a GeForce GTX 780 Ti video card mining for Mjollnircoin and with enough interest this new coin might replace the also HEFTY1-based HVC crypto currency that has been going down lately.