Cloud services with free trial and so on...
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Backend
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CI (continuous integration)
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Coverage, code smells, static analysis
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Dependencies, libraries checker
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Server monitoring
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Log monitor/analyzers
- Papertrail
- Log.io
- GoAccess real-time web log analyzer
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Storage
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Fonts tools
- Fontsquirrel squirrel fonts
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Images tools
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DataBases
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Static servers for Landing Pages or blogs
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JSON servers
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Wiki or project readme
- ReadMe.io - free for open source projects
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API Documentation
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Markdown Editors
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Generators for testing
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Chats
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Online code converters
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Mailing tools
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Payment tools
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Prorotyping
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Metrics
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Maps
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IP to geocode
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Articles parser/retriever