Reading:
http://classic.net.bible.org/bible.php
Again, a great resource for definition possibilities and grammar indications.
They do a much better job representing the Greek grammar; you can almost just go on what they state the grammar is completely.
But I did say, "almost".
A few times I have found their transliteration to be counter to papyri, which then changes the grammatical manner in which the word is translated.
Generally, I don't see this as a problem, however, as in doing translation work of Greek you should always check against multiple sources for what the Greek is written as (it's fairly common for accidental errors to occur in this field for Greek; not to mention the variations in manuscripts and papyri).
http://www.greekbible.com/
I generally use this along side of net.bible.org as a double check of the conjugations in use. When I see a divination, I start looking at the Papyrus directly (if more than one papyrus, then I look at them all).
http://cpp.arts.kuleuven.be/index.php?page=browse
Last photography library for Papyri has decayed to being a non-functional site. Until I can locate another resource for images, I have placed the above resource which does not have photographs, but does contain the text transcriptions from the papyri, as well as full publication and finding information to assist you with locating a photograph if needed.
http://en.wikipedia.org/wiki/Categories_of_New_Testament_manuscripts
Just handy to have for looking through Papyri.
Clicking on a Papyrus' or Manuscript's nomenclature takes you to a wikipedia description of the papyrus or manuscript, which then tells you what is written in that particular papyrus or manuscript.
Also great if you want to only work with a certain dating period for translations.
Further, it is essential if you want to know which category of Papyrus or Manuscript a text is in; there is a remarkable difference in some areas between Alexander and Byzantine Papyrus and Manuscripts; actually causes some heated debates in the field.
http://nttranscripts.uni-muenster.de/AnaServer?NTtranscripts+0+start.anv
UNRIVALED resource for seeing Alexandrian and Byzantine comparisons and textual variants that take place.
Even lists which papyrus or manuscript has what parts of the verse in which manners in color coded, easy to read, format.
Hands down one of the best resources for Greek in the Bible.
http://www.islamic-awareness.org/Bible/Text/Mss/P52.html
A great site for learning what content is in a papyrus and where it was found, if known (the latter is considerably important, as a translator may only want works from given regions).
Dictionaries:
http://classic.net.bible.org/bible.php
As mentioned, doubles as a dictionary.
http://www.laparola.net/greco/parola.php?p=ἀ
Use the greekbible.com site to grab a copy of a word in Greek and replace the part of the address that reads, "ἀ", with the word you are interested in and you'll end up with simply the best definition listing I've seen for classic Greek (at least Biblically related words).
It even lists all variants of conjugations in Greek so you can see what other forms of the same word look like in other uses.
Also lists multiple dictionary definitions rather than just one so you get a better overall grasp of the concept of the word.
http://www.motorera.com/greek/lexicon/a.html
When laparola lacks a word, this site is the next best resource.
Grammar:
http://www.biblicalgreek.org/grammar/
Very in-depth and excellent resource for learning everything about the classic Greek.
http://www.ntgreek.org/learn_nt_greek/grkindex.htm
Another very in-depth and equally excellent resource for learning everything about the classic Greek.
http://www.ntgreek.org/learn_nt_greek/nouns1.htm
Fantastic quick outline of how nouns work in Greek
http://www.ntgreek.org/learn_nt_greek/verbs1.htm
Fantastic quick outline of how verbs work in Greek
http://www.drshirley.org/greek/grammar/g_verb-2AIAb.pdf
Great PDF for seeing what many conjugations look like in the Greek, as well as basic treatments of them in the English.
http://www.donpotter.net/PDF/Roberts'%20Grammar%20Lesson%2021.pdf
Another pretty nice PDF for seeing what many conjugations look like in the Greek in basic formats; also has some exercises if you need to try your hand at things.
http://www.ibiblio.org/koine/greek/lessons/pronoun2.html
Decent site for seeing what some conjugations look like in the Greek.
Classic Greek Fonts:
http://www.russellcottrell.com/greek/fonts.asp