OpenSim

Name	OpenSim
Website	opensimulator.org
Free	Yes
Multiplatform	Yes
Physics engine	Yes
Sound and music	Yes
Persistent worlds	Yes
Data logging	Yes
Object manipulation at runtime	Yes
Animated gestures	Yes
Collaborative Editing	Yes
Chat and IM	Yes
Server-client networking	Yes
Opt-out content rights	Yes
Friends lists	Yes
Texture upload at runtime	Yes
3D model upload at runtime	Yes
HTML4 on an object	Yes No HTTPS
Voice Chat / VoIP	Yes
e-Commerce	Yes Setup challenges
Appearance customization	Yes
Heightmap terrain	Yes
Runs on low spec devices	Yes Lag
Used by a large community	Yes Relatively
Imports OAR files	Yes
Commercial use	Yes
Low Monthly costs	Yes Self-host
Complex 3D shape editing	Yes Hollow/taper/twist
Imports IAR files	Yes
Open source	Yes
Tutorials and documentation	*1.0/5* 1 rating
Vehicles and alternate control	*2.0/5* 1 rating
User Interface scripting	*1.0/5* 1 rating
Backups	- Console/scripts
Scriptable characters	- MockingBOT
Combat and interaction	- Limited
Scalability	- Bloating
Scripting at runtime	- LSL
Existing VR support	- Experimental
Animated 3D models	- Avatar only
Command-line and APIs	- Console only
Shared content library	- Not by default
Large region sizes	- Varregions
Used by large companies	- Education
Content marketplace	- SecondLife
HTTPS and Cookies	No
Stereoscopic 3D	No
HTML5 on an object	No
Skeletal tracking	No
Hand tracking	No
Mobile support	No
Pathfinding and AI	No Not implemented
Augmented Reality (AR)	No
Peer-to-peer networking	No
Cameras	No
Render-to-texture	No
HTML5 Client	No
Garbage collection	No
Opt-in content rights	No
Future migration options	No
Game console support	No
Minimal network data	No Constant
Animate at runtime	No Upload BVG
Soft body physics	No
Physcally based rendering	No