The web site of the popular open source encryption tool TrueCrypt suddenly disappeared and visitors are redirected to a SourceForge page with this note: “WARNING: Using TrueCrypt is not secure as it may contain unfixed security issues”, and the web site also mentions that the development of TrueCrypt was ended in 05/2014 after Microsoft ended the support for Windows XP, but the web site does not give any reason why the development of TrueCrypt was suddenly ended, and as a result it caused lots of speculations around the world. A new version of TrueCrypt (7.2) is provided but according to the announcement this version is only for migrating data encrypted by TrueCrypt to BitLocker, and you cannot use it to encrypt data.
I have been using TrueCrypt for many years to encrypt my USB flash drives and my laptop system partition to protect my data and computer, and I sincerely hope the developers can give an explanation of the situation and will continue the development. It has been quite a while since the last release of TrueCrypt of version 7.1a which supports Windows 7. Though this version works with Windows 8 too, it is not officially confirmed or recommended. In the beginning of May 2014 when I visited TruCrypt forum, some users asked the future development of TrueCrypt and they were told by developers that they are working on UEFI to make TrueCrypt compatible with Windows 8, but now it seems that all traffic to TrueCrypt home page including to their forum site will be redirected to truecrypt.sourceforge.net where the warning is posted.
This abrupt termination of the popular open source tool definitely adds more doubts about the reliability of FOSS development and support, besides the quality assurance issue, when the development is only provided by a group of anonymous volunteers without the support and supervision from a reputable company.
Here is a list of TrueCrypt alternatives: https://www.comparitech.com/blog/information-security/truecrypt-is-discoutinued-try-these-free-alternatives/