Links to the tools I use most often, and to some that I seldom use but don't want to forget.
NET Bible Classic
http://classic.net.bible.org/ - My favorite; features the New English Translation (NET), provides a flexible search tool, and for each passage: translation comparisons including the original languages, Greek and Hebrew word-study tools, and links to bible dictionaries and encyclopedias, and essays, sermons and study guides.
https://www.biblegateway.com/passage/ - A great source for parallel (side-by-side) comparisons of (lots of) different translations; also has nice search tools, though you must select only one translation in which the search will be conducted.
Greek Word Study Tool
http://www.perseus.tufts.edu/hopper/morph?la=greek - Greek word study tool at Tufts University provides a look at the secular meanings associated with Greek words from the New Testament. The NET tools at Bible.org only provide a Christian perspective in most cases; and sometimes it helps to see what meaning non-Christian people attached to those words.
http://www.sefaria.org/texts/Tanakh - My first choice for insight from a Jewish perpective, this site features a modern English translation (JPS 1985) (and would be far more useful if I learned to read the commentaries that are presented in Hebrew).