GTasks for G Suite - Lets you to manage your Google Tasks from Docs allowing you to tackle your to-do list.
eFileCabinet - . eFileCabinet Document Management Software is more than just “going paperless”. eFileCabinet is freedom, convenience, peace of mind, and profitability.
Metadrive for G Suite - Metadata management for Google Drive
M-Files - M-Files is an enterprise information management system that helps users with organizing and managing documents.
AODocs - AODocs is the document management solution recommended for G Suite. Secure your documents, structure your content, & automate your processes
Dropbox DocSend - Dropbox DocSend is a secure file and document sharing solution that gives users analytics and control of document in their critical workflows. Key features include sending documents as secure links, eSignature, and customizable virtual data rooms.