The core functionality of Bloo is all handled by its core SnapOns (located in the "core" subdirectory). These include

bloo_events
bloo_pages
bloo_queue
bloo_stats
bloo_utils
bloogroll
comment
error
extension
http
log
look_and_feel
mail
menu
pinger
post
rss
scripts
security
settings
static_page
trackback