Meta Search - Search your Desktop, Google Drive, Dropbox, Gmail, Evernote.
Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
Google Cloud Search - Search across all your company's content in G Suite.
Listary - Listary is a revolutionary search utility for Windows
Vaultedge - Access all your documents in one place.
Alfred - Alfred is an award-winning app for macOS which boosts your efficiency with hotkeys, keywords, text expansion and more. Search your Mac and the web, and be more productive with custom actions to control your Mac.