SymWin is described as 'A small and quick tool for typing special symbols'. There are more than 10 alternatives to SymWin for a variety of platforms, including Windows, Mac, Linux, BSD and PortableApps.com. The best alternative is BabelMap, which is free. Other great apps like SymWin are Character Map (Free), WinCompose (Free, Open Source), PopChar (Paid) and WizKey (Paid).
BabelMap is a 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.
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.
Holdkey is a Windows program that makes it easy to type characters with accents. No more hassle with alt codes or other time consuming methods to create characters like : é à ø ü € ß ñ ï ç ö e g and many many more.