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The request I receive most often is from readers asking for links to “interesting” TOR (onion) sites. So here are a couple to keep you going.
TOR Search Engines
Candle is a basic search engine. It contains a small but interesting subset of TOR sites.
Grams is a dark market search engine for labour, digital & physical goods that can be purchased with various currencies including Bitcoin. It searches the most popular darknet markets including Hansa, AlphaBay, Agora, Nucleus Market, Majestic Garden, Oxygen, Outlaw Market, Oasis, Tochka and Arsenal.
Haystack is another TOR (darknet) search engine and claims to have indexed 1.5 billion pages (which makes it one of the most comprehensive TOR search engines). In my experience, this site is a hit type of thing. Every couple of searches fail for me.
Security sites
GnuPG (open source version of PGP) allows users to cryptographically sign and encrypt email communications.
OnionShare is a free and opensource tool that allows users to securely and anonymous share large files over the TOR network.
Anonymous Pasting sites
There may be times when you want to post (public or private) a snippet of text with the world. The common feature shared by most of these TOR based services is that pastes delete automatically after a certain amount of time. These are TOR alternatives to pastebin.com
DeepPaste is a very simple and basic pasting service.
RiseUp pasted are automatically deleted within a week. Additionally you can share files up to 50MB.
Pasta is an open source paste service that supports standard pastes, editable pastes, self-burning pastes and URL shortener.
Confidant Mail is a free and open srouce non-SMTP encrypted email system that leverages GNU Privacy Guard (PGP).
Daniel email service is a free anonymous email and XMPP service (limit of 25MB storage space). Encryption is not built into the service.
Elude is an email service with encrypted storage with a TOR only web client. Their accounts are completely anonymous, they allow you to purge your data completely if required and provide encryption.
I wrote a review about ProtonMail here and their well designed email service is also accessible via the TOR network. This is a very good option because unlike the other email services here, ProtonMail is a real company offering a professional service.
Social sites
Cyph Messenger is an open source video chat and file transfer app that uses a modified Signal messenger protocol enhanced with Quantum Resistant encryption (their claim).
Dread is a TOR Reddit clone that is used primarily as a drug market discussion and reviews forum.
Here is the Facebook TOR site.