After further research, it's possible that a v17b version was released before v17.1b (which would have been released the following day), however I unfortunately can't confirm this.
Dofus v17.1b
Officially the last beta version, version v17.1b was released on July 30, 2004; the news about the switch to this version is available here. This update adds the Dofus eggs and various balance changes. On undocumented elements, this update adds monsters as well as new maps — part of southern Amakna is added (porcos, gelees, scaraleafs), the tree house is moved, Amakna's cemetery island arrives, and for the rest of the new maps I don't know exactly. There's also the addition of Dofus eggs obtainable via drops; I have information that the Minotoror dropped the purple Dofus egg and had a fairly long respawn time — it appeared in the fields of Amakna and in the scaraleaf plains. Another addition is teleportation runes, which allowed traveling anywhere — I don't have more information about these runes, but the system was much more flexible than the zaap system.
Dofus v17.2b
A second version of this beta came out; this version fixes the issues from v17.1b and was released on August 4, 2004, its changelog can be viewed here. There are a lot of changes, I'll only cover the most interesting ones.
Let's start with the teleportation rune nerf, removing the ability to teleport to certain maps. The biggest changes are on the server side, with the addition of AI for summons. There's also mention of characteristic scrolls, which could explain the appearance of Loopine — the scrolls are described as having a bug that got fixed, so it's possible they were added with v17b. Obtaining these scrolls is treated as quests.
On August 6, 2004 the server was updated and added the XP bonus for group fights, up to 200% at 8 players.
Screenshots from these versions
You can see this screenshot which was taken on the last versions of the beta (presence of NPCs and the bug icon on the right). This screenshot shows the game just before the end of the v17.2b beta. Another screenshot shows the characteristics interface with trades; this screenshot was taken between v15b and 1.0 but I don't know exactly when.
A world map is available here but beware, some of the map images come from version 1.0 (Amakna's bank, for example). Finally, the world map roughly corresponding to this version is available here; the cursed forest area may have already been available, however at the time it was "forbidden" to spoil the path, so there's no information on it.
Flash Player
On this forum page there's a thread called "New features at the Flash Client v17b level" — from what I know, Dofus versions from v17b to 1.13 need a version of the Flash player between version 7 and 9; maybe v17b is the first to require the switch to Flash Player 7 without fully using all its features.
