Navigate to /Library/Receipts/InstallHistory.plist and search, (Edit:) i.e. command-F, for either MacKeeper or ZeoBit, and see if you come up with anything.
There aren't any receipts but the History Plist shows:
<key>date</key>
<date>2011-09-19T19:35:49Z</date>
<key>displayName</key>
<string>MacKeeper</string>
<key>displayVersion</key>
<string></string>
<key>packageIdentifiers</key>
<array>
<string>com.zeobit.MacKeeper.affid.pkg</string>
</array>
<key>processName</key>
<string>Installer</string>
</dict>
<dict>
<key>date</key>
<date>2011-09-19T19:35:53Z</date>
<key>displayName</key>
<string>MacKeeper</string>
<key>displayVersion</key>
<string></string>
<key>packageIdentifiers</key>
<array>
<string>com.zeobit.MacKeeper.pkg</string>
</array>
<key>processName</key>
<string>Installer</string>
<key>date</key>
<date>2012-09-22T22:41:05Z</date>
<key>displayName</key>
<string>MacKeeper 2012</string>
<key>displayVersion</key>
<string></string>
<key>packageIdentifiers</key>
<array>
<string>com.zeobit.MacKeeper.affid.pkg</string>
</array>
<key>processName</key>
<string>Installer</string>
</dict>
<dict>
<key>date</key>
<date>2012-09-22T22:41:10Z</date>
<key>displayName</key>
<string>MacKeeper 2012</string>
<key>displayVersion</key>
<string></string>
<key>packageIdentifiers</key>
<array>
<string>com.zeobit.MacKeeper.pkg</string>