BabelMap is described as 'free character map application for Windows that allows you to browse through the entire Unicode character repertoire of over 107,000 characters, or search for a particular character by name or by code point'. There are more than 25 alternatives to BabelMap for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and Android. The best alternative is Character Map, which is free. Other great apps like BabelMap are WinCompose (Free, Open Source), Shapecatcher (Free), Character Map UWP (Free) and Font Viewer (Free).
Shapecatcher is a new website, that helps you to find specific Unicode characters, just by sketching their shape. Currently about 10000 of the most important Unicode characters are compared to your sketch and are analysed for similarities.
Font Viewer is an application which does exactly that - it views fonts! Arrange and view a large number fonts which are installed on your computer, applying their various styles to text of your choice.
The character map that works! PopChar is an application that lets you insert special characters, umlauts and foreign letters into any document. With this character map, there is no need to search for or remember complex keystrokes.