Ewido Security Suite
Though Ewido is more of an adware/spyware detection program I'll also list it at the trojan section, since there are much more adware/spyware scanners out there compared to trojan scanners. This suite is very popular and not because it's so well known (how did it get so well known) but because it won several prices, doesn't use much resources and is easy to use as you will see later on.
Trial: download
Latest definitions: download
License / key : 1yr license
Features:
- Detects Trojans, worms, dialers, backdoors, keyloggers, spyware, adware and browser hijackers
- Heuristic scanning mode (detects unknown malware)
- Realtime protection against Trojans, worms, dialers, backdoors, keyloggers, spyware, adware and browser hijackers
- Customized scanning/detection options
- NTFS-ad scanner (detects hidden datastreams)
Installing, configuring and using Ewido
Problems using Ewido, and their solutions