FileBot can automatically rename tv show / movie files, and download subtitles. It requires little work, as media files can just be drag'n'dropped in for operation. It's cross-platform and comes with a command-line version.
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Recent Releases
4.505 Oct 2014 22:43
major feature:
* Allow users to choose between (default) Opportunistic / (new) Strict mode matching
* Fix "freezing" issues when loading (very) large sets of files
* Improved episode / movie / music auto-detection and matching
* Improved support for non-English language preferences
* --action duplicate to duplicate files via hardlink when possible or copy when necessary
* --db xattr for fast offline re-processing using previously stored xattr metadata
* New bindings model and self for advanced use cases
* Lots of optimizations and usability improvements (especially on Mac OS X)