Mac (10000 programs)

Pros: Can find hidden files that spotlight won't pick up. Supports all common operations such as Copy, Paste and Remove to Trash. Improves search precision by matching and combining terms. Lets you 'quick look' at files to check if it's the one you want.

Cons: Too slow to be consistently reliable. Only available in English. Worth getting only if you need to find specific hidden files. Very bland interface, unappealing to non-professionals.

Pros: Annotate documents. Make notes in audio and video. Supports highlighting and sketching. Export functionality.

Cons: Only supports two file formats. Very intensive on resources. UI not particularly easy to understand. Does not work directly with web pages.

Pros: Versions for PCs and mobile devices are available. No credit card is required to download. An intuitive user interface.

Cons: Some website sections do not employ SSL encryption. In terms of the access required, this software is rather invasive.