GospelHarmonyResources.opml

Indices and Harmonized Text Presentations
  Michael Marlowe's arrangement of Kurt Aland's Synopsis Quattuor Evangeliorum: 367 pericopes with hyperlinks to the texts. One peculiarity (or perhaps feature) is that pericopes are repeated so each Gospel's material is in order: that accounts for the large number of pericopes. I assume this is a feature of Aland's original (which i haven't seen), not Marlowe's presentation. I can't easily tell how many unique pericopes he'd have without this repetition: far less than 367, though. In addition, he groups passages from different authors that have some similarities, even when they are clearly different (e.g. the responses to sermon on the mount (Matt 7.28-29) and the teaching in the synagogue at Capernaum (Mark 1:21-22)).
  JB Phillips' Harmony of the Story of Jesus has a top-level organization that is both chronological and topical: it repeats material from each Gospel to give the full picture. Unfortunately the individual pericopes aren't presented in a separate index, so you have to get down into each text to find them, which is a bit awkward.
  McGarvey's Four-fold Gospel is another fairly contemporary harmony.
  Robert C. Long's harmony is available for download.
  Herbert R. Rinder's Composite Gospel is a very similar idea to this one, though i conceived of this approach prior to discovering it. Rinder's work combines many passages across the Gospels with similar topics, even if the settings are clearly distinct: for example, his entry for "two important commandments" combines one story where Jesus affirms the commandments to love God and love your neighbor, and another where a religious teacher affirms them in response to a question from Jesus. His work therefore groups things that i have split into separate pericopes.
  Life of Christ by Lorin Cranford
  biblesearchengine.com/Aarons Bible University has some work on chronological ordering of the Gospels, unfortunately all in HTML or PDF, so not easily reusable. It does include some information attempting to date and place certain passages, which bears further review.
  The Synoptic Gospel Outline has a navigation frame listing the various sections, hyperlinked to show the text.
  The Five Gospels Parallel includes some clearly apocryphal works (Gospels of Thomas and Paul.
  Gospel Harmony based on a course by Walter Elwell of Wheaton. Unfortunately the link to the whole harmony in Excel format doesn't seem to work.
Early Works
  Tatian's Diatessaron is the earliest known example of a "Gospel harmony". Though Tatian was later branded a heretic, there is some evidence that his Diatessaron was used throughout early Christendom: translated manuscripts in numerous widely-dispersed languages have been found. Here's more information on Tatian.
  The Diatessaron of St. Ephrem (in French)
  St Augustine's Harmony includes substantial commentary on the differences between the passages.
Link Collections
  "the Synoptic Problem and Q" by Dr. Mark Goodacre (University of Birmingham)
Other
  ourlovingGod.net has an overview of the major historic sections of Jesus' life and ministry, based on F. LaGard Smith's narrative commentary on the life of Christ
  BibleTime examines how to date events in the life of Jesus
Other
  Life of Christ has a nice table of events in the Gospels, dynamically sortable by approximate chronology, or by the order of the individual Gospels.