These fonts are supported by tools like Azhagi+ , which allows for easy transliteration and typing in various Tamil encodings, including STMZH.
: Provides a suite of free Tamil typing tools that are often bundled with or support the STMZH encoding. Installation Guide STMZH ] Tamil font in Photoshop CS/CC Version Using Azhagi+ stmzh+073+font+download+free