ZelCore is described as 'fully-featured digital asset wallet for everyone. With ZelCore you can store and manage over 200 cryptocurrencies and assets, including up to 12 individual wallet addresses for each' and is a Crypto Wallet in the bitcoin & cryptocurrency category. There are more than 50 alternatives to ZelCore for a variety of platforms, including Android, iPhone, Mac, Windows and Linux. The best alternative is Electrum, which is both free and Open Source. Other great apps like ZelCore are Coinbase, Exodus, Kraken and Green: Bitcoin Wallet.
ZelCore is mainly a Crypto Wallet but alternatives to it may also be Cryptocurrency Exchanges. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of ZelCore.
Electrum is an easy to use Bitcoin client. It protects you from losing coins in a backup mistake or computer failure, because your wallet can be recovered from a secret phrase that you can write on paper or learn by heart.
Blockchain is one of the few wallet applications that keeps control over your money in your own hands. In the original spirit of Bitcoin, it is physically impossible for BlockChain to "freeze" your account or any such nonsense.