Let's use this thread to share cool software, websites, tricks, hacks, etc. that people may not be aware of.
[
EDIT: I will add future links to this post for the sake of simplicity.]
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ACADEMIC EARTH [via
Mindfulness] - This website lets yoiu take free online courses.
COURSERA [via
Pet_Sounds] - This website lets you take free online courses.
ENGINEERING TOOL BOX [via
Plankton] - Tools and basic information for design, engineering and construction of technical applications.
FAX ZERO - This website let's you send faxes online for free. No registration required.
FILE SHREDDER - This free software PERMANENTLY deletes files from your computer by over-writing that space on the drive [multiple times] with a random string of binary code.
JPGRAR - This free software allows you to embed
.RAR archives inside of
.JPG images. Hide important files inside of images.
MIT OPEN COURSEWARE [via
Pet_Sounds] - This website lets you take free online courses from
MIT.
RECUVA - This free software allows you to retrieve files that have been deleted from your computer.
TOR2Web - This website lets you explore the deep web by accessing
.onion links on a regular web browser. No registration required.
WEB CAPTURE - This website lets you convert and save any website as
PDF or image. No registration required.
THE WORLD PASSPORT - If your government refuses to issue you a passport, you can get one online.
The World Government Of World Citizens issues passports that have been accepted by
187 countries worldwide.
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COOL TIP: Say you are doing a
Google search for cats and only want to find a certain type of results [
PDF's for instance], simply type
filetype:PDF along with your search term.

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HOW TO DOWNLOAD TORRENTS WITHOUT ANY SOFTWARE:
You can download torrents without using any software by using a free online torrent client. The best one is called
Seedr. It supports files up to
2 GB. Other free options include
Zbigz and
BitPort, but they only support files up to
1 GB.
Seedr &
BitPort require you to register, but it is free. Another free online torrent client,
FileStream, requires registration and supports files up to
200 MB.
Where do you get torrents? There are plenty of sites. If you like movies, the site I prefer is
YIFY Torrents.
The Pirate Bay is also very popular.
Download your torrent or copy its magnet link [the online address of the torrent] and upload/paste it into the online torrent client.
The client will piece the files together and give you a download link. That's all there is to it!
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HOW TO VIEW OLD VERSION OF WEB PAGES:
Web links often change. Do you need to view a past version of a web page? Is a page down and you want to see what it last looked like? There are several web archivers that will allow you to do so.
The WayBack Machine - Powered by the
Internet Archive, this site allows you to search for and view old versions of web pages. Search
URL’s and narrow the results by specific date. Over
300 BILLION web pages have been archived here.
Archive.is - This site allows you to save current versions of web pages, as well as search for and view old versions of web pages. Search using
URL’s.
WebCite - This site allows you to search for and view old version of web pages. Search using
URL’s, a specific date and/or a Snapshot ID.
The Coral Content Distribution Network - This site allows you to search for and view old versions of web pages. Search using
URL’s.
Time Travel - Powered by
MementoWeb, this sites allows you to search for and view old versions of web pages. Search using
URL’s and specific dates.
What Did It Look Like? - Powered by
MementoWeb, this sites allows you to search for and view old versions of web pages. Search using
URL’s.
Search Engine Caches - All major search engines [
Google, Yahoo, Bing, etc.] allow you to view cached [saved] versions of web pages. Use their search engine to find the page you want. When the page shows up in the search results, there is an option to view the cached version.