"In my opinion Calibre is a marvelous tool but is too big and has too much dependencies to be used for its content server. That's the main reason why I coded this OPDS server. I needed a simple tool to be installed on a small server (Seagate Dockstar in my case).
I initially thought of Calibre2OPDS but as it generate static file no search was possible.
Later I added an simple HTML catalog that should be usable on my Kobo.
So COPS's main advantages are :

• No need for many dependencies.
• No need for a lot of CPU or RAM.
• Not much code.
• Search is available.
• It was fun to code."  From: Cops Source

Double page splitter: Useful to split the pages from a book scanned opened.

Free Time Stamp servers:
http://sha256timestamp.ws.symantec.com/sha256/timestamp
http://timestamp.globalsign.com/scripts/timstamp.dll
https://timestamp.geotrust.com/tsa
http://timestamp.verisign.com/scripts/timstamp.dll 
http://timestamp.comodoca.com/rfc3161
http://timestamp.wosign.com
http://tsa.startssl.com/rfc3161
http://time.certum.pl
http://timestamp.digicert.com
https://freetsa.org
http://dse200.ncipher.com/TSS/HttpTspServer
http://tsa.safecreative.org
http://zeitstempel.dfn.de
https://ca.signfiles.com/tsa/get.aspx
http://services.globaltrustfinder.com/adss/tsa
https://tsp.iaik.tugraz.at/tsp/TspRequest
http://timestamp.apple.com/ts01
Source

Remove files recursively:
find . -type f -iname '*.jpeg' -delete
find . -type f -iname '*.jpeg' -exec rm {} \;
find . -type f -iname '*.jpeg' -exec rm {} +
shopt -s globstar && rm -- **/*.o

Backup clonning using Hard Links
rsync -avm --ignore-existing --link-dest=. $SOURCE/ $DESTINATION/

Remove empty directories
find . -type d -depth -exec rmdir {} \;

The hardest part to activate eBay 2FA is to found the right URL. Here you are: https://scgi.ebay.com/ws/eBayISAPI.dll?ActivateSecurityToken
I didn't know that I could activate eBay 2FA using the Symantec VIP Access softkey (https://m.vip.symantec.com) because the eBay page states the hard token as only option. You need to use the VIP Access Credential ID as the hard key serial number and wait for two timed Security Codes to use as OTP.
But I found a even better alternative: https://github.com/cyrozap/python-vipaccess is a python FOSS "implementation of Symantec's VIP Access client. It is able to generate OATH URIs and their corresponding QR codes so any TOTP-generating application can be used as a VIP OTP token."
You don't need two apps. You can generate a QR code and register it in an app like Authy or Google Authenticator

Source Windows
Source Intel Rapid Start
WARNING: This will destroy all your data.

HINTS:

• You can run DISKPART commands using only the first three letters
  
• You can save DISKPART commands as a script and run them using DISKPART /S SCRIPT.TXT
• You can list windows mounted drives using WMIC LOGICALDRIVES GET CAPTION,FILESYSTEM
  



Source
If you try to do a clean install of Windows 10 in an UEFI machine, it will read the UEFI key and install the most basic Windows, i.e., Windows 10 Home.
You can force it to ask the Edition (Home or Pro) putting a simple text file ei.cfg inside the ISO in \Sources folder with just two lines:

If you have Microsoft Hypervisor installed, it will take up the cpu VT-x so any other Virtual Machine System will accuse that your system hasn't support to virtualization. You need to disable its launching to release the cpu VT-x support to other VM like Oracle Virtualbox or VMWare.
Source