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Cerulean

A lightweight native Bluesky client for power users. Supports Windows 95/98 - 11

Cerulean is a great client for Bluesky (still in beta stage, though) that is:

lightweight (uses around 40MB of ram, 20MB if not including images from posts),
native (C# and WinForms)
compact (detailed, efficient and feature-packed user interface for power users)
and compatible (supports Windows 95 with the .NET backport, Windows 98 to 11 natively).

This is the only client out there that caters to power users with its compact interface while also being able to run on an OS below Windows 10.

Other clients