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Fernando Garrido Vaz
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Nice and simple, and effective. I'm a happy user.
Toggl
insanely simple free time tracking
Fernando Garrido Vaz
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Very interesting concept, based around longer-lived streams (called "hashes") next to which there is a chat pane for more synchronous communication. Can be a useful tool for remote teams, or perhaps to replace forums or support channels in some cases.
Shrtct
Break down complex issues, tease out new ideas.