This directory hierarchy is sorted roughly, but not completely, alphabetically:

etc
- plugins
examples
- ansaExamples
  - cesnet
    - ospf
    - rip
- rtp
  - multicast2
src
- ansa
  - acl
  - deviceConfigurator
  - ethernet
  - FormalAnalysis
  - igmp
  - InterfaceStateManager
  - IPGen
  - ipSplitter
  - ipv4
  - ipv6
  - isis
  - linkBreaker
  - ospfv2
    - interface
    - messagehandler
    - neighbor
    - router
  - ospfv3
    - interface
    - messageHandler
    - messages
    - neighbor
    - router
  - pim
  - ppp
  - qos
  - rip
  - routingTable
  - switch
    - stp
  - TrafficGenerator
  - transport
- applications
  - ethernet
  - generic
  - pingapp
  - rtpapp
  - sctpapp
  - tcpapp
  - udpapp
- base
- linklayer
  - contract
  - ethernet
  - etherswitch
  - ext
  - ieee80211
    - mac
    - mgmt
  - mf80211
    - macLayer
    - phyLayer
      - decider
      - snrEval
  - mfcore
  - ppp
  - radio
- mobility
- networklayer
  - arp
  - autorouting
  - common
  - contract
  - extras
  - icmpv6
  - ipv4
  - ipv6
  - ldp
  - mpls
  - ospfv2
  - queue
  - rsvp_te
  - ted
- transport
  - contract
  - rtp
    - profiles
      - avprofile
  - sctp
  - tcp
    - flavours
    - queues
  - tcp_nsc
    - queues
  - tcp_old
    - flavours
    - queues
  - udp
- util
  - headerserializers
    - headers
- world