X-Sat is a microsatellite developed and built by the Nanyang Technological University (NTU) in collaboration with Defence Science Organisation (DSO) Singapore. The satellite was launched by  ISRO's PSLV-C16 on 20 April 2011 from Satish Dhawan Space Centre FLP in Sriharikota, India. The satellite was launched along with Indian ResourceSat-2 and Indo-Russian YouthSat.
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Suryanarayana, P. S. (20 April 2011). "Singapore delighted at ISRO's launch of X-Sat". The Hindu. Chennai, India.
T.S., Subramanian (19 April 2011). "PSLV-C16 launch today". . Chennai, India. Archived from the original on 3 May 2011 The Hindu . Retrieved . 19 April 2011
NSSDC ID: 2011-015C
A few photographs of the development process
Academic paper discussing the design of the X-Sat PPU
The X-Sat PPU: designed to be the first Beowulf cluster in space