Lastpass - LastPass is an online password manager and form filler that makes web browsing easier and more secure.
DeHashed - DeHashed is the largest & fastest data breach search engine.
1Password - 1Password can create strong, unique passwords for you, remember them, and restore them, all directly in your web browser.
LeakCheck - Data breach search engine, low price starting from $10/mo, one email address for free, unlimited API, 7B+ entries
KeePassX - KeePassX is an application for people with extremly high demands on secure personal data management. It has a light interface, is cross platform and published under the terms of the GNU General Public License.
Snusbase - The industry leading database lookup.