[General Topics] atErik:
File Compression (zip, archive, compact, pack) & Decompression (unzip, unarchive)

[SIZE="+1"]FEW CHOICES FOR FILE COMPRESSION (aka: ZIP, ARCHIVE, ENCRYPT, COMPACT, PACK), or, DECOMPRESSION (aka: UNZIP, UNARCHIVE, DECRYPT, EXTRACT, UNPACK) TOOLS:[/SIZE]

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[SIZE="+1"]Windows[/SIZE] platform/os:

7-zip : open-source, GUI, CLI, 7zip-manager can compress+decompress multi files+folders, encrypt/decrypt, LZMA & various other formats & algorithms are supported.

http://www.7-zip.org/

https://SourceForge.net/projects/sevenzip/

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[SIZE="+1"]Mac OS X[/SIZE] platform/os:

(some core portions of this OS is BSD or FreeBSD Unix)

7zX : a 7-zip based derivative, GUI, encrypt is supported, it can do only one file at-a-time compression.

http://7zx.UpdateStar.com/

Keka : a 7-zip based p7zip derivative, open-source, GUI, compress+decompress tool, encrypt/decrypt, obtain free-edition from their website.

http://www.KekaOSX.com/

The Unarchiver : GUI, decompression tool, decrypt only, obtain it from Apple iTunes Mac AppStore.

https://itunes.apple.com/us/app/the-unarchiver/id425424353?mt=12

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[SIZE="+1"]Linux/Unix[/SIZE] platform/os:

p7zip : a 7-zip based derivative, open-source, compress+decompress tool, encrypt/decrypt.

https://SourceForge.net/projects/p7zip/

p7zip for Debiaun, Ubuntu, etc.

https://packages.debian.org/sid/p7zip-full

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[SIZE="+1"]Android[/SIZE] [SIZE="+1"]/[/SIZE] [SIZE="+1"]CyanogenMod[/SIZE] [SIZE="+1"]/[/SIZE] [SIZE="+1"]Replicant[/SIZE], etc platform/os:

Total Commander by C. Ghisler : file management software/tool, available in Google Android PlayStore, it can compress & browse/view, encrypt only. It requires such Permissions: Photos/Media/Files (modify or delete the contents of your USB storage, read the contents of your USB storage), Other (access Bluetooth settings, pair with Bluetooth devices, full network access, view network connections, prevent device from sleeping, install shortcuts).

http://www.ghisler.com/android.htm

https://play.google.com/store/apps/details?id=com.ghisler.android.TotalCommander

ZArchiver by ZDevs : available in PlayStore, free, it can compress+decompress and browse/view, encrypt/decrypt, it does not use Un-Necessary Permissions or System Level Accesses.

https://play.google.com/store/apps/details?id=ru.zdevs.zarchiver&hl=en

UnZip & Unrar - Zip file by UCWeb Inc : To use it, user must also install the tiny web-browser "UC Browser Mini - Save Data" (1.5MB) from same developer, (unselect the "Cloud Acceleration - wap access via server" option in UC Browser after install, if you prefer higher-level "security" more, than slightly higher speed). Unzip-&-Unrar is available in play appstore, free, decompress, decrypt, it does not require extra unnecessary permission, but the web-browser does need access to many Permissions.

https://play.google.com/store/apps/details?id=com.uc.addon.decompress

https://play.google.com/store/apps/details?id=com.uc.browser.en

Unzip Tool by lichy : available in play appstore, free, decompress + compress, file browse, encrypt/decrypt. though it works on many android version but it uses lots of unnecessary Permissions & accesses, like: Location (precise location (GPS and network-based), approximate location (network-based)), Photos/Media/Files (modify or delete the contents of your USB storage, read the contents of your USB storage), Wi-Fi connection information (view Wi-Fi connections), Device ID & call information (read phone status and identity), Other (view network connections, full network access). So avoid it if you care more about higher-level "security", unless you must have to have a such tool's functionalities. (i included it, because i also have firewall (frwl) and it is configured to not-allow send/receive any stuff through internet, and i have noticed it's file-browsing feature was slightly better than few other similar apps in older android os).

https://play.google.com/store/apps/details?id=com.lichy.unzip

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[SIZE="+1"]iOS[/SIZE] (iPhone/iPad) platform/os:

zip rar tool free - (zip/unzip/unrar/un7z) from email & File manager for Dropbox, Box (by tau xu) : available in iOS/iPhone/iPad iTunes AppStore, free, compress+decompress tool, encrypt/decrypt.

https://itunes.apple.com/us/app/zip-rar-tool-free-zip-unzip/id649649718?mt=8

ZipApp Free - The Unarchiver (by Langui.net) : available in iOS/iPhone/iPad iTunes AppStore, free, multi-format decompression tool & zip-only compression), multi format decrypt & zip-only encryption.

https://itunes.apple.com/us/app/zipapp-free-the-unarchiver/id585600850?mt=8

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[SIZE="+1"]Windows 10 Mobile / Windows Phone[/SIZE] platform/os:

"Windows Phone" is successor of "Windows Mobile", and "Windows 10 Mobile" is successor of "Windows Phone".

STARchiver ZIP RAR (by Attractor Mobile Software) : free, compress/decompress, encrypt/decrypt.

https://www.microsoft.com/en-us/store/apps/starchiver-zip-rar/9nblggh67q7l

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REFERENCES & List of AppStores & Repositories:

* wikipedia.org/wiki/Comparison_of_file_archivers

* https://apps.microsoft.com/ (Windows Store, aka Windows AppStore, for Microsoft Windows OS based PC, Laptop, Notebook/Netbook, Surface, Tablets, etc x86/x86-64/ARM)

* https://Cygwin.com/ (Repository of Linux & Unix & open-source POSIX tools & apps & packages, made usable for (Microsoft) Windows OS. It does not require an administrative user access during install & update. Also used for loading required dependencies, compiling, and to obtain cygwin*.DLL for POSIX apps/tools).

* https://MinGW-w64.org/ (Repository of Linux & Unix & open-source POSIX tools & apps & packages, made usable for (Microsoft) Windows OS. It does not require an administrative user access during install & update. Also used for loading required dependencies, and includes GCC compiler. Note: This website uses SSL/TLS cert from "nautica.notk.org" which is issued by CAcert.org, so you will have to add that SSL/TLS cert as a temporary exception in your web-browser, for accessing the website over HTTPS connection).

* https://itunes.apple.com/us/genre/mac/id39 (Apple iTunes AppStore, for Mac OS X computers)

* https://www.apple.com/osx/apps/app-store (Apple Mac OS X AppStore, for Mac OS X computers)

* https://www.MacPorts.org/ (Repository of Linux & Unix tools & apps & packages, made usable for Mac OS X. It requires an administrative user access during install & update. Also used for loading required dependencies, and compiling.)

* https://Brew.sh/ (HomeBrew) (Repository of Linux & Unix tools & apps & packages, made usable for Mac OS X. It does not require an administrative user access during install & update. Also used for loading required dependencies, and compiling. This website is using a common SSL/TLS cert from their GitHub project, so used SSL/TLS cert is not their own)

* https://addons.mozilla.org/en-US/firefox/ (Mozilla's Firefox web-browser Addons & web-browser based App list, for Windows OS, Mac OSX, Linux, Unix, etc computers)

* https://chrome.google.com/webstore/category/extensions/ (Google's Chrome web-browser extension list, for Windows OS, Mac OSX, Linux, Unix, etc computers)

* https://chrome.google.com/webstore/category/apps/ (Chrome web-browser based App list, for Windows OS, Mac OSX, Linux, Unix, etc computers)

* wikipedia.org/wiki/List_of_free_and_open-source_iOS_applications

* https://github.com/dkhamsing/open-source-ios-apps

* https://itunes.apple.com/us/genre/ios/id36 (Apple iTunes AppStore for iOS/iPhone/iPad/etc)

* https://www.apple.com/appstore (Apple iOS App Store. Note: unless an iOS based web-browser's user-agent string is set or found, this URL will detect user-agent string and user's IP-address location, and then it will auto-forward users/visitors to a different appstore. Another simpler alternative is, use the iTunes app to browse+view iOS App Store apps).

* http://apt.saurik.com/ (SaurikIT Repository, aka Cydia appstore, for Jailbroken iOS/iPhone/iPad etc, more info)

* wikipedia.org/wiki/List_of_free_and_open-source_Android_applications

* https://play.google.com/store (Google Android Play Store AppStore, aka Android Market, aka "Vending" appstore, aka Google AppStore, aka, Google-Play AppStore)

* https://F-Droid.org/repository/browse/ (F-Droid.org Repository for Android & AOSP based OS)

* https://www.WindowsPhone.com/store (includes apps for both Windows Phone, and Windows 10 Mobile)

* https://addons.mozilla.org/en-US/android/ (List of web-browser based addons & apps for Mozilla's Firefox web-browser for Android) (Firefox Browser for Android from Play-store, Firefox web browser for iOS/iPhone/iPad etc, from iTunes appstore for iOS/iPhone/iPad etc) (Note: Firefox for iOS does not support addons yet)

* http://www.GetJar.com/mobile-apps/ (List of Java Jar based apps for various mobile multiple platforms)

* List of more Software Package Management Systems (wikipedia).

If you find free tools are useful or helpful or not-intrusive for you, then please try to donate what you can, so that developer/group can continue to develop & update & provide a non-intrusive program for free. Please do not donate & do not encourage those, who make intrusive/spying programs.