The last real release of TrueCrypt (7.1a) is generously being hosted on Gibson Research Corporation's TrueCrypt page. The TrueCrypt source code, binaries, and User Guide can be downloaded there. The checksums are hosted offsite by Defuse Security.
The current development source is available at GitHub.
git clone https://github.com/CipherShed/CipherShed.git
This is only a test copy! Please do dangerous tests like whole disk encryption in a VM!
Thanks to Rocki Hack's work, upgrading from TrueCrypt is now a smooth process! We have tested with upgrades from TrueCrypt 7.1a and 6.3. If you have any trouble upgrading from prior TrueCrypt versions, please let us know on the firstname.lastname@example.org list. You should be able to open existing TrueCrypt volumes.
For a signed windows binary, please refer to https://ciphershed.org/pre-alpha-testing-started/.