Skim is an open-source
PDF reader. It is notably the first
free software
Free software or libre software is computer software distributed under terms that allow users to run the software for any purpose as well as to study, change, and distribute it and any adapted versions. Free software is a matter of liberty, no ...
PDF reader for
Mac OS X
macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and la ...
. It is written in
Objective-C
Objective-C is a general-purpose, object-oriented programming language that adds Smalltalk-style messaging to the C programming language. Originally developed by Brad Cox and Tom Love in the early 1980s, it was selected by NeXT for its NeXT ...
, and uses
Cocoa APIs. It is released under a
BSD license
BSD licenses are a family of permissive free software licenses, imposing minimal restrictions on the use and distribution of covered software. This is in contrast to copyleft licenses, which have share-alike requirements. The original BSD lice ...
. It is also cited as being able to help annotate and read scientific papers.
History
Its initial release was in April 2007, at version 0.2. Within its first year it managed to gain a small fan base of users due to its ease of use and features which allowed some flexibility over other PDF browsers for Mac OS X. As of 2008 it had achieved version 1.0. Its main developers were also responsible for another popular open-source program,
BibDesk
BibDesk is an open-source reference management software package for macOS, used to manage bibliographies and references when writing essays and articles. It can also be used to organize and maintain a library of documents in PDF format and other ...
.
Features
Some of its features include the ability to view and bookmark PDFs, highlight and underline selectable PDF text, and a full-screen and presentation mode, along with a split mode that allows scrolling a PDF separately in two parts on the same screen. It also allows the adding of circles and boxes, as well as being able to embed and edit notes.
See also
*
List of PDF software
This is a list of links to articles on software used to manage Portable Document Format (PDF) documents. The distinction between the various functions is not entirely clear-cut; for example, some viewers allow adding of annotations, signatures, e ...
References
External links
*
MacOS-only free software
Free software programmed in Objective-C
Free PDF readers
Software using the BSD license
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