I am accessing my accounts and everything using Ethereum Wallet (Mist) but I was wondering is there any possible way to access my account using some
Sure, but you need to launch geth with the web3 and personal modules:
geth --datadir myGethDirectory --rpc --rpcport "8000" --rpc-api "admin,db,eth,debug,miner,net,personal,web3"
Note that anyone with access to the machine running geth will be able to use its RPC interface. So use this option only on trusted/secure networks.
To unlock an account run:
web3.personal.unlockAccount("0x1234...", "password", timeout);