Personal Package Archive. A ppa with many packages not shipped with debian official repository. It is not advertised since some of the packages are not tested.
extend-left-box. A gnome-shell extension to extend left box of top panel. The project discontinued as I no longer use gnome-shell.
Early developer of USTC Campus Ethernet Boot Service. A PXE boot service in USTC campus, people can boot their computer via LAN to install Linux, experience distros without installation, repair system, etc. Also made an live debian system which mount an ftp space as home directory so people can boot 'their own' system everywhere.
Maintainer of USTC Open Source Mirror. It has the highest traffic among open source mirror sites in China, and is official mirror of many distros and projects, e.g. Debian, Ubuntu, etc. Did a lot of work tuning kernel, filesystem and applications for high traffic load.
RoboGame. It is an traditional robot contest in USTC campus. Built a complete robot from scrach with sensors, motors and AVR mega16 chips as controller, in collaboration with 3 other classmates. i was mainly responsible for controlling algorithm design and implementation.