The first edition of the Book of Mormon was published in 1830. Other important edition include the 1837, 1840, and 1981 editions.
Facsimiles of Most or All Editions: Book of Mormon Online
Or At Other Locations:
Printer’s Manuscript
1830 with modern ch, verse (& parallels)
The Joseph Smith Papers: 1830, 1837, 1840, 1841
1840, 1830, 1908 RLDS
Modern: various formats at project Gutenberg
Book of Mormon Online
Modern: at LDS.org (with footnotes)
1830 text copiable & SEARCHABLE (with LDS ch/v links at bottom)
1830 In html with LDS chapter/verse added
1830 (single page HTML) at Wikisource
1830 to 2013 nearly all “facsimiles” + some O
1840 searchable on Google
1874 on Google
1903 on Google
1913 on Google
1981 on Google
1981 (HTML) at WikiSource
1999 Restored Covenant Edition (text online) (RLDS x LDS verse crosswalk)
2009 The Book of Mormon: The Earliest Text on Google (and BoM Central)
2013 at ChurchofJesusChrist.org