Chrome //
Extensions 
Chrome
Web store 
JSON Viewer
The most beautiful and customizable JSON/JSONP highlighter that your eyes have ever seen. Open source at https://goo.gl/fmphc7
JSON Viewer Pro
A completely free extension to visualise JSON response in awesome Tree and Chart view with great user experience and options.
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Xodo PDF Viewer & Editor
Fast & reliable PDF viewer, editor, and annotation tool with Google Drive support.
Chrome extension source viewer
View source code of Chrome extensions, Firefox addons or Opera extensions (crx/nex/xpi) from the Chrome web store and elsewhere.
Docs Online Viewer
Open and view any online file in your browser. Supports almost all major file and document formats. Fast, easy to use and free.
KML, KMZ Viewer with Drive
A tool that views the KML, KMZ (Zipped KML format) file on a map. You can open KML, KMZ files from URL or from Google Drive.
Project Viewer 365-Free
Viewer for Microsoft Project: Open/Print MPP Files without MS Project.Supports MS Project 2013,2010 plus all prior ver
GPX Viewer, Reader
The GPX viewer is made for the purpose of viewing the gpx file. You can load tracks from gpx file and show them on a Maps view.
PDF Viewer
PDF Viewer, Reader allows you to view PDF, DOC, XLS, PPT files directly in your browser without uploading the file to any servers.
Web Cache Viewer
Want to view cached pages and cached websites? Right-click on any link or page to view the Wayback Machine or Google Cached pages.
Panorama Viewer
This is a small and very flexible viewer for panoramic images and interactive virtual view. View panoramic images, 360 panorama.
CAD, DXF, DWG Viewer for Drive
AutoCAD, DXF and DWG Viewer for Google Drive. It is a tool that allows you to view CAD files (DXF, DWG...) in your browser.
DICOM viewer extension
Extension for arranging web browser windows and tabs for smoother user experience in DICOM viewer application.
SQLite Viewer with Google Drive
This app allows you to view SQLite Database on your browser. It can help you to easily manage, and open the SQLite database.
Open with Google Drive™ Viewer
Open online resources with Google Drive Viewer. Supports various formats including DOC, XLS, PDF, PPT, ZIP, HTML, TXT, JS etc.
Awesome PDF Viewer, Reader
PDF Viewer, Reader is a free tool that allows you to view PDF files directly in your web browser.
HEIC Image Viewer Decoder
This app allows you to view and decode directly HEIC, HEIF images in your browser, and Save as a PNG, JPEG file format.
Exif Viewer
View the EXIF data in your photos. Select photos on your device or on a web page. Simply right-click on an image in a web page.
Jupyter Notebooks IPYNB Viewer
This app allows you to convert Jupyter Notebooks (ipynb) to HTML, PDF format. View a ipynb file from your browser directly.
Comic CBR, CBZ Viewer
This app allows you to view and read directly CBR, CBZ, PDF comic books in your browser. easy navigation and image enhancements.
EML, MHT Viewer with Drive
This utility parses and displays EML(mail message), MHT files. Inline images are displayed both as attachments and in the HTML.
Smart Notebook™ Viewer and Reader
This Reader is a viewer for Smart Notebook (*.notebook) file, it can help you to open a Notebook file and read its content.
ODT, ODP, ODS Viewer
This viewer lets you view Open Document Format files without leaving your browser. View odt, odp, ods, doc, xls, ppt.. and more.