Here are some links to things that I find interesting and that are important for my work.

Texts relating to tuning theory

• Fundamental Principles of Just Intonation and Microtonal Composition - Thomas Nicholson and Marc Sabat.
• John Cage and the Theory of Harmony - James Tenney.
• Varieties of Just Intonation - Kristofer Svensson.

Material about Gagaku

• Introduction to Gagaku - Jarosław Kapuściński, François Rose and Ensemble Reigakusha.
• Composing for Shō - Chatori Shimizu.
• The Ashgate Research Companion to Japanese Music - David W. Hughes and Alison McQueen Tokita.
• Music of a Thousand Autumns: The Tōgaku Style of Japanese Court Music - Robert Garfias.

Software

By me:

• EPL
  System for playing phase-locked oscillators, used in the piece EPL.
• Cembalo
  Sample player used in the piece Stycke för cembalo och elektronik.
• MHSho
  SuperCollider class mimicing the behaviour of the Japanese mouth-organ shō.
  Used in the piece Hypothermia for bass drum.
• Gamba
  Sample player for playing back samples of string instruments.
  Used in the piece Breathing, bowing.

By others:

• REAPER
  Affordable and extremely extensive and customizable digital audio workstation.
• SuperCollider
  “A platform for audio synthesis and algorithmic composition, used by musicians, artists and researchers working with sound.”
• MuseScore
  Free and open source notation software. Works out-of-the-box with the HEJI notation system, but no hassle-free microtonal playback as far as I understand it.