Available for Windows and MacOS X
LICEcap can capture an area of your desktop and save it directly to .GIF (for viewing in web browsers, etc) or .LCF (see below).
LICEcap is an intuitive but flexible application (for Windows and now OSX), that is designed to be lightweight and function with high performance.
In addition to .GIF, LICEcap supports its own native lossless .LCF file format, which allows for higher compression ratios than .GIF, higher quality (more than 256 colors per frame), and more accurate timestamping. If you record to .LCF, you can play back the .LCF files within REAPER (and/or use it to convert to .gif or another video format).
1.2.923 Sep 2019 11:19
v1.29 - February 18, 2019
+ macOS: 32/64-bit UB, compiled with newer Xcode/ICC
+ Windows: use WM_NCHITTEST for moving of window when dragging window