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platform
lsFusion is an extremely declarative open-source language-based platform for information systems development (by lsfusion)
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
lsFusion platform is designed for rapid development of business applications. It is distributed under the terms of a Lesser General Public License (LGPLv3). The source code of the platform is available on Github.
You can then explore the source code for MyCompany, which implements the basic logic of a simple ERP system. This solution is distributed under the Apache-2.0 license, and can be used as a basis for developing your own system.