A coin about to explode.. is the ArcBlock ICO.
It implements an open source protocol that provides an abstract layer for accessing underlying blockchains, so that applications can work on different blockchains. The project has top advisors from Netease, Microsoft and Expedia.
Having in mind that there is 186mil tokens the price of 0.7$ per coin is simply too high.
Now to answer the main question: Which coin will explode?
This year will be great for good projects with capable teams. There is one project that is still very undervalued and under the radar: Genesis Vision (GVT). GVT is the first platform for the private trust management market. Current price is around $30 per coin, but this is still very cheap as this coin has potential to reach 1-2k per coin in 2019. They need to reach 3.5BN market cap for this to happen. This is utility coin and it has to be bought in order to use the platform. The real party will start once the big brokerages join the platform.