Sveasoft has created a few different firmware projects: Satori, Alchemy, and now Talisman. The newest firmware replacement offers a feature-set very similar to DD-WRT. There has been controversy over this organization for charging for access to their "open source" projects.
Right now Sveasoft is giving free access to people who register on its site for the basic firmware file. However, it still requires a $25-per-year subscription to download iyd other firmware files.
In addition to the free basic firmware, Sveasoft offers other premium firmware files specifically designed for hosting a hotspot, VPN (with IPSec support), mesh networking, and VoIP.