7-Zip – 流行的免费开源压缩软件。7-Zip是一款老牌拥有极高压缩算法的免费开源压缩文件管理器，提供命令行接口和图形界面操作，支持独立的7z格式及近乎所有压缩格式，包括ZIP, RAR, ISO, CAB, GZIP, BZIP2, TAR等。其多线程LZMA压缩比要比普通ZIP文件高达30-50%，它可以把ZIP格式的文件再压缩2-10%。
特性
7-zip.org/history.txt
20.01 alpha 2020-08-06
– The default number of LZMA2 chunks per solid block in 7z archive was increased to 64.
It allows to increase the compression speed for big 7z archives, if there is a big number
of CPU cores and threads.
– The speed of PPMd compressing/decompressing was increased for 7z/ZIP/RAR archives.
– The new -ssp switch. If the switch -ssp is specified, 7-Zip doesn’t allow the system
to modify “Last Access Time” property of source files for archiving and hashing operations.
– Some bugs were fixed.
– New localization: Swahili.
7-Zip 20.10 Alpha x32/x64 官方最新版 [2021/01/19]
https://www.7-zip.org/a/7z2100.exe
https://www.7-zip.org/a/7z2100-x64.exe
7-Zip 19.00 Final x32/x64 官方正式版 [2019/02/22]
https://www.7-zip.org/a/7z1900.exe
https://www.7-zip.org/a/7z1900-x64.exe
最高压缩比参数设置分享：
压缩等级>极限，算法>LZMA2, 字典>128MB, 单词大小->273
固实块大小->固实, CPU线程->2或3, 最下面的参数框->f=BCJ2
7z-build-nsis （支持反编译NSIS脚本的第三方编译版）
https://github.com.cnpmjs.org/myfreeer/7z-build-nsis/releases
https://download.fastgit.org/myfreeer/7z-build-nsis/releases/download/19.00-v1.4.5-R2/7z1900-x86.exe
https://download.fastgit.org/myfreeer/7z-build-nsis/releases/download/19.00-v1.4.5-R2/7z1900-x64.exe