https://kiswahili.ku.edu - KiSwahili University of Kansas- NALRC : free pdf Book/Peter Ojiambo: very nice practical topic based chapters with vocabulary, grammar and example phrases.
https://sites.google.com/a/wisc.edu/swahili/ - Language-Learning Resources for Swahili - for self directed learners
http://swahiliproverbs.afrst.illinois.edu
http://www.africa.uga.edu/Kiswahili - Kiko - online KiSwahili guide (with some audio samples) : Pronounciation example of each phoneme, and a list with examples of all noun classes