Electric bus manufacturers

India
Blackbuck, India Startup in Hyderabad that launched its new ebus in 2023.

USA
Phoenix Motor Cars, USA . Started in 2005. Electrifies Ford E450 vehicle. Purchased Proterra Transit Systems in January 2024 and will enter the transit bus market.
Proterra, USA. Electric transit bus manufacturer. Bankrupt in 2023. Transit Bus division sold to Phoenix Motor Cars, Proterra Powered Systems became part of the Volvo Group, Proterra Energy continues as an independent company.

see: https://www.imarcgroup.com/united-states-electric-bus-companies

Netherlands
VDL
Ebusco

Belgium
Van Hool