Open Horizons has served international donor agencies, foreign companies as well as Non-Governmental organisationsin the region. The following form some of the clientele served:

  • Anglican Church of Kenya, Kenya
  • Aweil Agency for Relief & Development (AWARD), South Sudan
  • Berghof Foundation, Germany
  • Catholic Diocese of Nakuru, Kenya
  • Catholic Diocese of Tombura Yambio, South Sudan
  • Diakonie Katastrophenhilfe (Diakonie Emergency Aid), Germany
  • Feed the Minds, United Kingdom
  • GOAL Kenya Office, Kenya
  • Homeplans Construction Co. + Other Local Traders in Juba, South Sudan
  • International Relief and Development, U.S.A.
  • Kaniu & Prieske Project Management Co. Ltd., Kenya
  • Kenya Evangelical Lutheran Church, Kenya
  • Max Planck Institute for Comparative Public Law and International Law, Germany
  • Max Planck Foundation for International Peace and the Rule of Law, Germany
  • Meth e.V., Germany
  • Norwegian Church Aid, Darfur, Sudan
  • Red Shed Co. Ltd., Kenya
  • Sudan Evangelical Mission, S. Sudan