List of some of the major Crypto-Currencies as of now:

• Bitcoin
• Ripple
• Ethereum
• Litecoin
• Zcash
• Dash
• Monero
• More are on the way

Advantages of Crypto-Currencies:

• Decentralized
• Digital
• Easy access
• Traded on exchanges
• Block-chain or similar modern database & protocol based non modifiable ledger of transactions
• Immediate settlement and difficult to reverse / refuse payment
• Lower fees
• Difficult to do identity theft for conducting fraudulent transactions

Disadvantages of Crypto-Currencies:

• Less or no regulation
• No or less audits of exchanges where they trade
• Price discovery does not follow standard financial rules
• Mining is ad-hoc and affects money supply
• Difficulty in reversal of payments in case of mistakes
• Price volatility
• Less clarity on taxation in some countries
• Anonymity
• Cutting edge technology which is yet to stabilize
• Functionally features are complex for layman to understand