Mapping for One-Place Studies - a forum

A full-function open GIS (commercial but possibly with a low price for personal development or volunteer work) from esri, designed for decision-making

A cloud computing platform that provides GIS and web mapping (was CartoDB)

How the various packages handle mapping (storing and display of location information)

An Open Source mapping framework

An "affordable and easy-to-use GIS application"

Field Trip runs in the background on a phone - when you get close to something interesting, it pops up a card with details about the location.

MapAble is a web based GIS application that aims to lower the costs of such an application in order to allow non-GIS professionals the benefit of spatial analysis, map visualization. Comes packaged with about 300 national (South African) datasets.

Mapbender is "the back office software and client framework for spatial data infrastructures. The software is used to display, overlay, edit and manage distributed Web Map Services. The maps themselves are generated by Server software."

MapJam was a web and mobile map publishing platform that allows businesses, organizations, and people to create useful, personalized maps that are easy to share - it shut down its services on February 6th, 2017

MapQuest.com is for driving directions, maps, live traffic updates and road conditions. There is also mapquest open, a general-purpose experimental online map for the whole world.

A platform for publishing spatial data and interactive mapping applications to the web

MapWith.Us is a geosocial networking website that allows users to create and share custom maps with an online community

Various apps and systems are designed mainly for drivers to navigate

A web application for collaborating on data, maps, projects - designed for non-GIS experts.

A project designed to store and display map data throughout the history of the world - a work in progress based on OpenStreetMap (OSM).

These services enable you to provide a table of locations and some data, and produce a map.

User-friendly Desktop Internet GIS - whose goal is to provide a complete Java solution for desktop GIS data access, editing, and viewing.

An open-content collaborative mapping project, aimed at marking all geographical objects in the world and providing a useful description of them. It aims to create and maintain a free, complete, multilingual and up-to-date map of the whole world.

These are the systems that other technologies use "underneath the bonnet". Anyone without a real interest in software systems is unlikely to use them - except as they are already built into something else.