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Boston-Icons
Boston is an exclusive icon theme inspired by functionalist design and a touch of early computer icons. The project is focused on elemental properties, basic shapes, a reduced color palette and visual hierarchy.
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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.
But I think the best solution is to ask those apps to include symbolic icons. And for users, one can use an icon theme that provide symbolic icons as a workaround. For example, unlike other themes, Boston doesn't have app icons, except if they are missing symbolic icons or looks too outdated.
NOTE:
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Hence, a higher number means a more popular project.