- ISO 9001:2008
- Burgas Municipality
- Deloitte – ETT
- egis Bulgaria
- ROM Transportation Engineering Ltd.
- Varna Integrated Urban Transport project – 1 2 3
- NEA Transport Research and Training B.V – 1 2 3
- Sofia–Vidin
- Gorna Oryahovica
- ECORYS
- BCEOM
- Bisuness park Sofia
- THE CANCELLOR GROUP
- GOPA-Consultants
- Deutsche Gesellschaft fuer Technische Zusammenarbeit (GTZ) – 1 2 3 4
- Ministry of Transport – 1 2 3