The three main branches of the Semitic language family are Hebrew, Arabic, and Ethiopian.
Many languages, such as Manchu, Mongolian, and Tifinagh, have alphabets derived from Semitic alphabets. Thus, the study of Semitic writing will lead us beyond the bounds of Semitic languages.
WWW sites related to Semitic grammars:
New archeological evidence, like the Temple Ostracon and the Tel Dan inscription, have given us evidence of written Hebrew and phrases from the Bible going back to almost 1,000 B.C.
Schick, George Victor The Stems...in Hebrew Leipzig: Drugulin, 1913. An example of the progress made by simultaneous study of congnate words in Ethiopic and Arabic.
Gesenius, Heinrich Friedrich Wilhelm authored numerous grammars, commentaries, and lexicons; together with Delitzsch, he can be reckoned as one of the founders of "wissenschaftliche" Semitic linguistics.
Patrick Bennet Comparative Semitic Linguistics: A Manual Eisenbrauns, 1998.
The Semitic Languages ed. Robert Hetzron. Routledge, 1997 don't overlook the article by Alice Faber "Genetic Subgrouping of the Semitic Languages." There's an excellent bibliography in the back of Waltke and O'Connor under the heading "Other Semitic Languages."
The Old Syriac Aramaic version of the four Gospels
The Peshitta Aramaic version of the NT
The Crawford Aramaic manuscript of Revelation
Introduction to the Semitic Languages: Text Specimens And Grammatical Sketches by Gotthelf Bergsträsser
Einführung in die semitischen Sprachen by Gotthelf Bergsträsser
Ein Behaimeh hat eine lange Zunge, und kann kein Baruch sagen.
An animal has a long tongue, and yet can say no blessing.
Ein Fauler ist gut zu schicken nach'm Malech-Hamoves.
It's good to send a lazy man for the angel of death.
Ein halber Emes ist eine ganze Lüge.
A half-truth is whole lie.
Ein halber Narr ist ein ganzer Chochem.
A half-fool is an entire wise man.
Ein Lügner bedarf [zu] haben einen guten Zechron.
A liar needs to have a good memory.
Der Schlaf ist ein Ganev.
Sleep is a thief.
Ganvet mein Bruder, hängt man den Ganev.
If my brother steals, it is the thief who is hanged.