Blockstack (STX):-
Blockstack is a new network for decentralized application. Blockstack addresses centralization at the application-layer of the internet by building an alternate DNS and alternate public-key infrastructure. Blockstack has three essential elements, privacy, storage, and tokens.
Blockstack provides users with their own identity in the form of digital keys that they own. This means users sign in to apps locally without remote servers or identity providers. Blockstack's storage system allows users to use their preferred storage providers and control their own data. User’s data is then encrypted and easily shared between applications. Blockstack uses crypto-currencies for simple peer-to-peer payments, allowing developers to charge for downloads, subscriptions, and more.
BlockCypher :-
BlockCypher is a Platform as a Service (PAAS) cloud-optimized platform that’s powers blockchain applications reliably and at scale. BlockCypher's web services greatly reduce the complexity of building applications that run on multiple blockchains and are blockchain agnostic. The development of applications on this platform are facilitated with web APIs and callbacks. BlockCypher hosting guarantees high throughputs, linear scaling, low-latency and over 99.99% uptime with no single point of failure.
Chain:-
Chain is an open-source, permissioned protocol built in collaboration with 10 financial and telecom firms. This platform can be used by institutions that can now launch and operate a blockchain network, or connect to other networks. The protocol defines how assets are issued, transferred, and controlled within a blockchain network, allowing single players or groups to operate a network.
Hyperledger:-
Hyperledger is a Linux Foundation project of open source blockchains and related tools to support the collaborative development of blockchain-based distributed ledgers. It gained momentum when IBM built it's blockchain on Hyperledger Fabric. Hyperledger Fabric is a blockchain framework implementation and intended as a foundation for developing applications or solutions with a modular architecture.