3
Replacing an unconfirmed transaction with another one isn't really double spending, as Chytrik mentioned.
Several of the older wallets do support dropping unconfirmed txs, freeing up the inputs another transaction. In my experience, Bitcoin Core and Electrum tend to be the best candidates for such actions.
Newer, more consumer facing wallets, such as ...
Only top voted, non community-wiki answers of a minimum length are eligible
