In recent 6 years, I was involved in water projects in Kenya and Rwanda by using FOSS4G software. A lot of water utilities in Africa are struggling to utilize their own GIS data because of lack of budget and skills. I was always thinking how they can easily manage their water utilities by GIS. Thus, I developed several open source software toolkits for water utilities in Rwanda and Kenya. The details implementation of softwares will be presented at the different talks - "An implementation of FOSS4G - QGIS, QField and Vector Tiles for rural water supply management in Rwanda" and "The impact of application of FOSS4G on Non Revenue Water" in FOSS4G 2021. In this talk, I will introduce my developed open source software and also talk about what I will develop in the future. My tools are documented at GIS for Water website. I mainly develop three types of software as follows. Software for Vector Tiles Management - Generating, Updating, Deploying automatically Plugins for Mapbox GL JS v1 - mapbox-gl-export, mapbox-gl-legend, mapbox-gl-elevation, etc. Parcels, Terrain RGB and EPANET for Water Management This talk is related to the following talks: "An implementation of FOSS4G - QGIS, QField and Vector Tiles for rural water supply management in Rwanda". "The impact of application of FOSS4G on Non Revenue Water Edit". My developed tools use the following FOSS4G software: PostGIS: Data store for water utilities management Mapbox vector tiles: Using it for online web GIS service United nations vector tiles toolkit: Using it for base map. EPANET:Using it for hydraulic modeling. Currently my parters are as follows: Water and Sanitation Corporation (WASAC), Rwanda Narok Water and Sewerage Services Company (NARWASSCO), Kenya Nanyuki Water and Sewerage Company (NAWASCO), Kenya Nakuru Water and Sanitation Services Company (NAWASSCO), Kenya Authors and Affiliations – Jin IGARASHI: Open source GIS software developer, also former JICA expert of the water project in Rwanda. Developing GIS systems for water utilities in both Kenya and Rwanda as volunteer basis. Requirements for the Attendees – Implementations vector tiles based WebGIS for WASAC, Rwanda: https://rural.water-gis.com vector tiles based Web-GIS for Narok Water, Kenya: https://narok.water-gis.com vector tiles based Web-GIS for Nanyuki Water, Kenya: https://new.nawascogis.co.ke/ vector tiles based Web-GIS for Nakuru Water, Kenya: https://nakuru.water-gis.com Github repository https://github.com/watergis vector tiles tools documentation https://docs.water-gis.com Track – Software Topic – Software/Project development Level – 2 - Basic. General basic knowledge is required.