Today been 27 November 2021, I lead a talk with a team of Lion Mapper Nsukka, Nigeria. on the discuss of OpenStreetMap and HOT Tasking Manager as a tool for free open data mapping and it is free user approach for individual and organizations. OSM and HOT came into existence as an open data source due to lack of data availability about a location, on how to solve environmental issue was a challenge in the 80s. Created in 2004 by Steve Coast in the UK, who initially focus on mapping United Kingdom to help in free and widely distribution of data for everyone to use. OSM is a community owned and supported by OpenStreetMap foundation located in England and Wales. OSM provides geographic data with over 2 million users across the world. OSM and HOT Tasking Manager is open for volunteerism, were Mappers and individual can team up to contribute to open data mapping of their community by providing information about an unknown location via mapping (Mapathon) to be known. Volunteers here in OSM and HOT Tasking Manager help to contribute in open data mapping about disaster management and response of a location, were in turn aid disaster response team and organization to have access to that particular location. Data is save in OSM and HOT Tasking Manager database for future use by Government, NGOs and private organization who are thrilled and concern about the human and natural environment in response to any disaster or environmental challenge about a place which require a location based information.