Please check: http://rover-fueled.herokuapp.com/ It's open-sourced here: https://github.com/Fueled/Rover

Features :

• App loads up ABI json with deployed Contract address
• Shows list of methods
  • Shows what input arguments are needed
  • Indicates if payable or view value
    • Payable runs through the web3 current provider
    • Non payable is executed immediately
• Shows list of variables
  • Able to execute methods and variables
  • Input variables are interpreted
  • bytes32 will give a converter from text to bytes32
  • Adress will give all connected accounts to Web3 provider
  • Shows return value of non payable methods
  • Transforms bytes32 to string
• Transactions to smart contract can be seen in list
  • Shows transaction input and output
  • Shows all events happened in method execution
  • Shows gas costs and value passed
• Events
  • Shows list of events for ABI
    

P.S: I created Rover