Online Greek New Testaments

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Academic-Bible
This is the German Bible Society’s free online website containing versions of its texts, including the NA27 and UBS4, the LXX, and the Biblia Hebraica Stuttgartensia. There is no critical apparatus.
Anthony Fisher's NA26
This is an online NA26, which can be browsed and searched in a variety of ways. No Greek is required to be installed in order to view this GNT. 
Bible.com
This website has four Greek New Testaments: (1) NTPT, (2) SBL Greek New Testament, (3) 1624 Elzevir Textus Receptus, and (4) 1894 Scrivener’s Textus Receptus.
BibleDatabase
This software has the option to download the basic, public domain Greek New Testaments as well as the NA26 and UBS3. 
BibleGateway
This website has five Greek New Testaments: (1) 1550 Stephanus New Testament, (2) 1881 Westcott-Hort New Testament, (3) 1894 Scrivener New Testament, (4) SBL Greek New Testament, and (5) Mounce’s Reverse-Interlinear New Testament. 
Bible Study Tools' Greek Interlinear
Users can view the NA26 with the KJV or NASB. Greek words are keyed to Strong's numbers, and viewing does require the installation of Greek fonts.
Biblia.com
This website has the 1881 Westcott-Hort Greek New Testament, 1624 Elzevir Textus Receptus (with Morphology), Novum Testamentum Graece, Novum Testamentum Graece (Tischendorf), 1881 Scrivener’s Textus Receptus, 1894 Scrivener’s Textus Receptus (with Morphology), 1550 Stephen’s Textus Receptus (w/ and w/o Morphology), SBL Greek New Testament (as well as the apparatus), 2005 Robinson-Pierpont The New Testament in the Original Greek: Byzantine Textform.
Biblon2000
"This project is the work of David Harley, a graduate in Computer Science from the University of Edinburgh in Scotland and currently a student of languages and religion at the University of Queensland in Australia. Its overall aim is to try and make use of some of the newer features of the main web browsers to create an online version of the Greek New Testament which will not only be easy to use and have dynamic capabilities, but just as importantly will be a well presented and elegant rendering of this text."  
CSPMT Greek New Testaments
The Center for the Study and Preservation of the Majority Text has a list of full-text, .pdf downloads for a number of different published Greek New Testaments. These include Byzantine and TR texts.  
Digital Nestle-Aland Prototype
The Digital Nestle-Aland is the forthcoming electronic version of the standard scholarly edition of the Greek New Testament. It offers two major features not available in the printed book: Transcripts of important Greek manuscripts of the New Testament New complete apparatus based on these transcripts The Digital Nestle-Aland is a project of the Institute for New Testament Textual Research at the University of M√ľnster, Westphalia, Germany.
Elpenor Parallel English-Greek NT
This is an Elpenor resource, hosted online (i.e., not available for download), which allows visitors to read the Greek and English side-by-side. It features the Greek text according to the Ecumenical Patriarchate of Constantinople (1904/12), with corrections of typos made by the Church of Greece. 
Goodacre's All-In-One GNT
This page allows users to search several of the Greek New Testament versions and a variety of other key Bible resources from one location.
Great Treasures
This resource was previously known as Greek Bible Study. It contains a number of Greek New Testaments and allows up to five to be viewed simeoultaneously. Users can search, take notes, etc. 
HTML Bible
John Hurt’s parallel Greek New Testament package includes several Greek New Testament’s (Stephens 1550, Scrivener 1894, Byzantine-Majority, Westcott-Hort). The cost is $8.00 but it allows you to work without an internet connection since it is a download. 
LaParola GNT
In this site you can read the text of the Greek New Testament with the most important textual variants (alternative readings). Clicking on a Greek word in the text you can find some information about the word; hovering the cursor above a word gives a summary. The variant readings can also be read offline by downloading and installing the free program LaParola.  
Perseus Westcott-Hort GNT
This website provides users with a platform they can design to fit their needs. Words are matched to Liddell-Scott. 
Robert Fowler's Gospels & Acts
This page contains the Gospels and Acts. Users need the SPIonic Font to properly view.  
SBL Greek New Testament
The SBLGNT, edited by Michael W. Holmes, is available for free downoad and viewing online.  
The Nestle-Aland 28 Online
This is the German Bible Society's website for the Nestle-Aland 28th edition of Novum Testamentum Graece. The entire GNT can be viewed here. 
The Online Greek Bible
This resource features the NA26 with multiple different fonts. It is searchable and allows the user to hover over Greek words for parsing and lexical definitions.
The Unbound Bible
This website has the 2000 Robinson-Pierpont The New Testament in the Original Greek: Byzantine Textform (with parsed option), 1550/1894 Textus Receptus (with parsed option), Tischendorf’s 8th edition, Westcott-Hort Greek New Testament (with NA27/UBS4 variants; with parsed option). In addition, they have a modern Greek New Testament.
Tyndale House's Tregelles' GNT
This includes the original and corrected editions of the Tregelles' GNT. 
W-H Greek (w/ NA27 Apparatus)
Maurice Robinson, and Wieland Willker, provide a digital version of the Westcott-Hort text with the NA27 apparatus.
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Gospel Comparisons

An Introduction to the Triple-Tradition Comparisons
Robert L. Thomas presents this comparison following the section numbers and textual arrangements of Earnest de Witt Burton and Edgar Johnson Goodspeed, A Harmony of the Synoptic Gospels in Greek (Chicago: University of Chicago Press, 1947), with minor modifications. The text followed in the Comparisons is that of the UBS4. There are three parts to this work: (1) Part One: Triple-Tradition Comparisons; (2)Part Two: Double-Tradition Comparisons; (2) Part Three: Double-Tradition Comparisons in Triple-Tradition Sections.
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Video

Erasmus' Greek New Testament
Emory University has made this short video available through iTunes U. It is a 10 minute video of and commentary on Erasmus' Greek New Testament. Click number 3, entitled "Erasmus' Greek New Testament."