Libib — Cataloging software for books, movies, music & video games online.
Evergreen ILS — Software used by libraries to provide their public catalog interface as well as to manage back-of-house operations such as circulation (checkouts and check-ins), acquisition of library materials, and sharing resources among groups of libraries.
Koha Library Software — Scalable library management system.
CaseBox — Sophisticated case management solution to NGOs with flexible task, document and record management system.
Digital First Aid Kit — Tools for human rights defenders, bloggers, activists and journalists facing attacks themselves, as well as providing guidelines for digital first responders to assist a person under threat.
Martus — Encrypted digital platform aimed at humanitarian workers and organizations.
Umbrella — Digital and physical security app for people at risk.
Boxcryptor — Encryption software to secure cloud files.
Anki — Web service, software, apps, etc. that use flash cards for learning.
Bloom — Book Making Software from SIL International. Create simple books and translate them into multiple languages.
Edubuntu — An operating system (Ubuntu/Linux) that contains all the best free software available in education and make it easy to install and maintain.
Stellarium — Constellation drawing, star names, planet viewing, nebulae watching, and more.
Resilio — File synchronization between individuals and devices locally — without using the cloud.
7-Zip — My preferred archiver for zipped and compressed files - small digital footprint and easily transportable.
Adium (MacOS) — Chat client for MacOS systems that supports AIM, Bonjour, Google Talk, ICQ, IRC, Yahoo!, and others.
Android File Transfer — Incredibly useful software that allows you to browse and transfer files between your Mac computer and your Android device.
Audacity — Free audio editor and recorder — great for all types of audio editing and production.
AVG — Antivirus software for personal use.
Calibre — E-book application suite that allows users to manage e-book collections as well as to create, edit, and read e-books.
CCleaner — System optimization, privacy and cleaning tool.
ClamWin — Standalone antivirus program for Windows. Not a scanner, so will not run in the background and take up processes and resources.
EtherPad — Customizable online editor providing collaborative editing in really real-time.
Flux — Make the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day.
FocusWriter — Simple, distraction-free writing environment.
Foxit Reader — PDF document viewer and creator for PCs.
GIMP — GNU Image Manipulation Program. Graphics software for photo retouching, image composition and image authoring.
gPodder — Simple podcast client for Windows, MacOS, Linux.
HoRNDIS — USB tethering driver for Androids to MacOS.
HTTrack Website Copier — Save websites for offline viewing.
LibreOffice — Office suite that includes word processing, spreadsheets, slideshows, diagrams and drawings, databases, and composing mathematical formulae. (Mostly) compatible with Microsoft Office formats.
Lightworks — Free video-editing for uploading to YouTube.
MAMP — Local server environment.
Norton Power Eraser — Remove scam-ware and other viruses with this antivirus software.
Notepad++ (Windows) — Text editor which supports several programming languages.
Opera — Lightweight, customizable browser designed for speed.
Pidgin (Windows) — Chat client for PCs that supports AIM, Bonjour, Google Talk, ICQ, IRC, Yahoo!, and others.
Puppy Linux — Lightweight Linux distribution that focuses on ease of use and minimal memory footprint.
QuiteRSS Reader — Standalone RSS reader for monitoring your favorite RSS feeds.
SiteSucker (MacOS) — Download websites from the Internet.
SpaceSniffer — Tree map visualize and understand how folders and files are structured on your disks.
Sublime Text — Text editor for code, markup and prose.
Sumatra PDF (Windows) — PDF, eBook (ePub, Mobi), XPS, DjVu, CHM, Comic Book (CBZ and CBR) reader for Windows.
Thunderbird — Email application that is simple and convenient for offline connectivity.
Tor Browser — Browser that lets you bounce your communications around a distributed network of relays to prevent somebody watching your Internet connection from learning what sites you visit, prevents the sites you visit from learning your physical location, and lets you access sites which are blocked.
VeraCrypt — Free open source disk encryption software for Windows, MacOS and Linux.
VLC Player — Cross-platform multimedia player and framework that plays most multimedia files as well as DVDs, Audio CDs, VCDs, and various streaming protocols.
XnView — Easy-to-use photo viewer, organizer and converter.
ESRI — The industry-standard in GIS software and solutions. The suite of ESRI tools is pretty expansive, ranging from consumer-level items like their smartphone apps all the way up to enterprise-level server platforms.
Mapbox Studio — Design studio to create stunning interactive maps (formerly TileMill).
QGIS — Free and open-source GIS software platform.
R — Software programming language and software environment for statistical computing and graphics.
Tableau — Data visualization and business intelligence software (with built-in mapping charts and widgets).
Graphite — Secure, decentralized, and user-owned file creation, file storage, communication, and sharing.