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Extensions 
Chrome
Web store 
Duplicate File Finder, Cleaner for Drive
This is a handy tool that scans selected directories and finds, clears any duplicate files inside Google Drive.
Multiple File Rename for Google Drive
A free renaming app for Google Drive that provides better way to rename multiple files with fast, easy and minimal operations.
File Converter for Drive, Dropbox
Provide a free, simple file converter. Convert any document, archive, spreadsheet, audio and video file from one format to another.
File Request for Google Drive
This app allows you to collect and receive files (big or small) from friends, coworkers and clients, right into your Google Drive.
Drive Overwrite, File Replace for Drive
Allows you to overwrite, replace existing files in Google Drive. instead of creating new file. Upload one file or multiple files.
Bulk Web File, URL to Google Drive
This app allow you to save web files to Google Drive folder directly. You can transfer an unlimited size per a file (1M~GB).