Data (de)compressing Library by Markus Oberhumer /code/compress/lzo100.zip	17 Jan 1999 (catalog date) 375,931 bytes
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Favours speed over compression ratio which makes it very suitable for realtime (de)compression. Supports a lot of different operating systems and even the Atari ST TOS.

Mini LZO Realtime Data Compression Library by Markus Oberhumer. Fits in 6 kilobytes when compiled. /code/compress/mlzo100.zip	17 Jan 1999 (catalog date) 26,510 bytes
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LZO Data Compression Library v0.20 by Markus Oberhumer /code/fileutil/lzo020.zip	06 Oct 1996 (catalog date) 184,964 bytes
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over conscious about compression ratios and statistics and has many long files about its stats in the /doc directory, but no description about the API. You have to figure out how to use it yourself from the two short examples that come with it. Otherwise, it's fairly complete and you can decide which compression routines you'd like to link yourself (assuming you can figure out that much).