This application can perform the management of filters and labels easily.
The following Gmail setting is possible.

General
-Gmail display language
-Maximum page size
-Signature
-Personal level indicators
-Vacation responder

Accounts
-Send mail as
(Use Gmail to send from your other email addresses)

Labels
-Manage Labels

Filters
-Manage Filters

Forwarding and POP/IMAP
-Add a forwarding address
-POP Download
-IMAP Access