[1] He is also credited with writing the UUCP over SSL how-to, and contributions to User-mode Linux and international encryption kernel projects, among others.

Welte has become prominent for his work with gpl-violations.org, an organisation he set up in 2004[2] to track down and prosecute violators of the GPL, which had been untested in court until then.

Welte was part of Openmoko team, a project to create a smartphone platform using free software.

[4] On 25 July 2008, VIA Technologies appointed Harald Welte as its open source liaison.

On 19 March 2008, the Free Software Foundation (FSF) announced that it had awarded the Award for the Advancement of Free Software for 2007 to Welte,[6] stating that "The awards committee honored both Welte's technical contributions to projects like the Linux kernel and the OpenMoko mobile platform project, and his community leadership in safeguarding the freedom of free software users by successfully enforcing the GNU General Public License in over one hundred cases since the gpl-violations.org project began in 2004."