Tengwar is a writing system created by J.R.R. Tolkien for his constructed languages. Probably initially for Quenya and Sindarin, but it was also used for English and, since, has been adapted to various other languages.

Tengwar, on its own, is more like a template for scripts, rather than a script itself. It does have sounds assigned to the symbols, but those are more like suggestions. (I’m oversimplifying.)
So, to actually write a language in Tengwar, you need to use a particular ‘mode’.

Modes fall into two main categories: ‘full’ and ‘tehta’ modes. Or Quanta Sarmë and ómatehtar modes. The former represents vowels with dedicated letters, while the latter uses diacritics to represent vowels.
For example: Quenya is written using the Classical Mode – which is a tehta mode – while Sindarin is written using the Mode of Beleriand – which is a full mode – or a tehta mode with an ambiguous name.

• Tengwar
• Amanye Tenceli
  • A website that analyses the Tengwar and Sarati.
• Glǽmscribe
  • A transcriber that lets you transcribe various languages into various scripts – not just the tengwar. Though that’s the main appeal.