Using bitcoin core/qt you can send from multisig by generating a raw tx in the console.
You'll need to know the transaction hash, vout and scriptPubKey of the unspent outputs you want to spend.
You'll also need the private keys from the multisig address as well as the redeemScript.
Be careful, if you don't spend the full amount or specify a 2nd address, the remaining will be used as a mining fee.
createrawtransaction '[{"txid":"6a4c4c3acc5d535a9a...","vout":0}]' '{"1xSomeBitcoinAddress51245d":0.01}'
This will generate a hash, take that hash and plug it in the below in place of hash_from_createraw
signrawtransaction 'hash_from_createraw' '[{"txid":"6a4c4c3acc5d535a9a...","vout":0,"scriptPubKey":"a91440c7dbad...","redeemScript":"52210347f3394f..."}]' '["priv_key"]'
This will generate another hash, take this and insert it below in place of hash_from_signraw
signrawtransaction 'hash_from_signraw' '[{"txid":"6a4c4c3acc5d535a9a...","vout":0,"scriptPubKey":"a91440c7dbad...","redeemScript":"52210347f3394f..."}]' '["priv_key2"]'
This will generate another hash, copy this hash and paste it in place of hash_from_2nd_signraw
sendrawtransaction hash_from_2nd_signraw
This will send the transaction and broadcast it to the network, all done!