The Uniform Server is a free lightweight WAMP server solution for Windows. Less than 24MB, modular design, includes the latest versions of Apache2, Perl5, PHP (switch between PHP53, PHP54, PHP55 or PHP56), MySQL5 or MariaDB5, phpMyAdmin or Adminer4. No installation required! No registry dust! Just unpack and fire up!
I love it, but I'm really hampered by the new releases of UniServer Zero that cannot be run without administrative rights. Working in a corporation, I don't have admin rights, yet I work on localhost web development for many live projects. Using an older version of UniServer is not a good option since I need to use latest versions of PHP and MySQL as soon as possible.