Some links for Chrome OS:

Chrome PDF Viewer:
chrome-extension://mhjfbmdgcfjbbpaeojofohoefgiehjai/index.html

Chrome OS Files App:
chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj/main.html

Chrome OS built-in text-to-speech extension:
chrome-extension://gjjabgpgjpampikjhjpfhneeoapjbjaf/_generated_background_page.html

Chrome OS Connectivity Diagnostics:
chrome-extension://kodldpbjkkmmnilagfdheibampofhaom/index.html

CROSH methods:
chrome-extension://nkoccljplnhpfnfiajclkommnmllphnl//html/crosh.html
chrome-untrusted://crosh

Office Editing for Docs, Sheets & Slides:
chrome-extension://gbkeegbaiigmenfmjfclcdgdpimangkj/views/app.html

Chrome OS Files App preview parameters:
blob:chrome-extension://hhaomjibdihmijegdhdafkllkbggdgoj/[blob values]#view-FitH

Chrome extension icon parameters:
chrome://extension-icon/[ExtensionID]/[Number 1 to 128]/1

Chrome extension manifest file parameters:
chrome-extension://[ExtensionID]/manifest.json

Dedicated DevTools for Node:
devtools://devtools/bundled/node_app.html?remoteBase=https://chrome-devtools-frontend.appspot.com/serve_file/@e3225dafb6475864a1812a374d73a92e391635ac/&dockSide-undocked

Inspect views background page (Inactive) / DevTools App: 
devtools://devtools/bundled/devtools_app.html?remoteBase=https://chrome-devtools-frontend.appspot.com/serve_file/@e3225dafb8475864a1812a374d73a92e391635ac/&dockSide-undocked

Inspector:
devtools://devtools/bundled/inspector.html

Broken page:
chrome-error://chromewebdata/

Query to attach to DevTools URI:
?experiments=true&ws=localhost: [Enter local host]

Index of /var/log/:
file:///var/log/

For Linux Beta users:
chrome-untrusted://terminal/ (edited)
