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From 2015: "Reliable. Has been tested in live production since 2002 on billions of queries on an index of over 12 billion unique web pages, 24 billion mirrored." - http://www.gigablast.com/admin.html#features
This is new for me. If this is true it means that Gigablast is the leading free search engine by far.
I added GigaBlast Search to https://directory.fsf.org/wiki/Free_Software_Directory:IceCat_extensions_(proposed)
-- David Hedlund -- http://gnuzilla.gnu.org