Skim by the Skim Team

Skim by the Skim Team screenshots

Skim helps you edit and add notes to your PDF files.
Skim by the Skim Team 1.3 : Main Window

Alternative downloads

Awesome Screenshot -- Capture, Annotate and Share screenshot
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A small browser extension for taking webpage snapshots.
Note-C
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App for collecting notes, snippets, and any other piece of text.
Annotate Preferences
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It can sort your applications preferences by name.