Due to the spammers that love these sorts of questions, ANY post with link or URL will get cleaned off.
Wordpress no doubt is the most used content management system that
is used by millions.
Hence security is a concern some other plugins i would add to this list are:-
1.Wp db backup
2.Ask apahe password protect
3.Stealth login
4.Admin ssl secure plugin(use this only if you have ssl enable site).
5.User locker
6.Login encryption
7.Bad Behaviour
8.Exploit scanner
9.User spam remover
10.Bad Block Queries.

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