archive.today
archive.ph
Freezes one page on demand into a snapshot that keeps working when it moves
No sign-up
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Find, save, de-clutter and cite what you read.
archive.ph
Freezes one page on demand into a snapshot that keeps working when it moves
arxiv.org
Free preprints in physics, maths, computer science and quantitative biology
feedly.com
Collects the sites you follow into one reverse-chronological list you control
scholar.google.com
Searches academic papers and shows who has cited each one since
instapaper.com
Saves an article for later and strips it down to just the text
openlibrary.org
A catalogue page for every book ever published, many of them borrowable
printfriendly.com
Strips ads and navigation off a page so you can print or save it as a PDF
gutenberg.org
Seventy thousand out-of-copyright books as clean EPUB, Kindle and plain text
pubmed.ncbi.nlm.nih.gov
The index of record for biomedical literature, run by the US National Library of Medicine
web.archive.org
Shows you what a web page looked like on a date in the past
zbib.org
Turns a URL, DOI or ISBN into a formatted citation in any of 10,000 styles
By task
Archive
Kept on record so an old bookmark still leads to an answer. Each one names the site that does the job now.
delicious.com
The original social bookmarking service and the tag as we know it
google.com
The RSS reader that most of the web's early sharing culture ran on
ma.gnolia.com
Saved and tagged bookmarks you could search alongside other people's
trailfire.com
Strung pages into a guided trail with a note on each stop
Questions
There is no single answer, which is why this page lists 11 of them with their limits stated. If you want to avoid signing up entirely, 8 of these work with no account at all.
Every site in this category sends your input to its own server to do the work. That is fine for public material; for anything containing personal data, check the on-device collection instead.
Some already have. 4 entries in this category has been retired and moved to the Archive with a working successor, so an old bookmark still leads somewhere useful.