Can PL/SQL Developer support 64bit Oracle 11g database??

Yes, no problem. You will however need to install a 32 Bit Oracle 11g or 12c Client on a 63 Bit OS. PL/SQL Developer is a 32 Bit application, so it cannot interface with a 64 Bit Oracle Client.

The 32 Bit Oracle Client can communicate with a 64 Bit Server, even on the same machine if necessary. The 32 Bit client can coexist with a 64 Bit Oracle installation when installed in separate Oracle Home directories.
 
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