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polo
Advanced file manager for Linux written in Vala. Supports multiple panes (single, dual, quad) with multiple tabs in each pane. Supports archive creation, extraction and browsing. Support for cloud storage; running and managing KVM images, modifying PDF documents and image files, booting ISO files in KVM, and writing ISO files to USB drives. (by teejee2008)
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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.
I like the surprisingly not-mentioned Caja, but my favorite was the not-surprisingly unmentioned Polo (https://github.com/teejee2008/polo), which is unfortunately a long-dead project it seems. It still has some annoying bugs, but I wish it hadn't been abandoned or that someone would pick it up, because it had tons of promise.