Over the years ITC has worked on projects awarded and/or financed by several international and national institutions and initiatives, among which:
- European Commission
- EU General Directorates ІА, TREN, REGIO
- European Investment Bank
- EDV/Senter International, the Netherlands
- GTZ Deutche Gessellschaft fuer Technische Zusammenarbeit GmbH,Germany
- AFD, France
- Regional Environmental Centre for CEEC
- World Bank
- Trade Development Agency, USA
- South Balkan Development Initiative
- EcoLinks, an initiative of the Agency for International Developemnt, USA
- National Roads Agency, Bulgaria
- Ministry of Transport of Bulgaria
- Ministry of Regional Development and Public Works of Bulgaria
- Ministry of Economy of Bulgaria
- Capital Sofia City Municipality
- Municipality of Kardzali, Bulgaria
- Municipality of Gorna Orjahovitsa, Bulgaria
- National Company Railway Infrastructure
- State Company Port Infrastructure
- Capital Urban Transport Company, as well as
- Large number of private clients