- Pidgin [GNU GPL]
- SIM-IM [GNU GPL]
- Miranda IM [GNU GPL]
- aMSN [GNU GPL]
- Psi [GNU GPL]
- Exodus [GNU GPL]
- WinJab [GNU GPL]
- LLuna2 [GNU GPL]
- wxSkabber [Aladdin Free Public License]
- CenterICQ [GNU GPL]
- aiMutation [GNU GPL]
- Coccinella [GNU GPL]
- Tkabber [GNU GPL]
- Ayttm [GNU GPL]
- BuddySpace [JOSL]
- Gabber 2 [GNU GPL]
- TSIM [GNU GPL]
- BitlBee (gateway to IM networks) [GNU GPL]
- Retroshare [GNU LGPL]
Misspellings: unstant, jnstant, knstant, onstant, 9nstant, 8nstant, ibstant, imstant, ijstant, ihstant, inatant, inztant, inxtant, indtant, inetant, inwtant, insrant, insfant, insgant, insyant, ins6ant, ins5ant, instznt, instsnt, instwnt, instqnt, instabt, instamt, instajt, instaht, instanr, instanf, instang, instany, instan6, instan5, nstant, istant, intant, insant, instnt, instat, instan, nistant, isntant, intsant, insatnt, instnat, instatn, iinstant, innstant, insstant, insttant, instaant, instannt, instantt, nessaging, kessaging, jessaging, mwssaging, msssaging, mdssaging, mrssaging, m4ssaging, m3ssaging, measaging, mezsaging, mexsaging, medsaging, meesaging, mewsaging, mesaaging, meszaging, mesxaging, mesdaging, meseaging, meswaging, messzging, messsging, messwging, messqging, messafing, messaving, messabing, messahing, messaying, messating, messagung, messagjng, messagkng, messagong, messag9ng, messag8ng, messagibg, messagimg, messagijg, messagihg, messaginf, messaginv, messaginb, messaginh, messaginy, messagint, essaging, mssaging, mesaging, mesaging, messging, messaing, messagng, messagig, messagin, emssaging, msesaging, messaging, mesasging, messgaing, messaigng, messagnig, messagign, mmessaging, meessaging, messsaging, messsaging, messaaging, messagging, messagiing, messaginng, messagingg