Sites
Acompanhar proposals do JavaScript (https://www.proposals.es/)
Avaliações de Softwares (https://www.b2bstack.com.br/)
Baixar fontes (https://www.dafont.com/pt/, https://fonts.google.com/. https://fontshare.com/)
Baixar músicas com free royalty (https://www.bensound.com/, https://sonniss.com/)
Banco de dados de timezones (https://www.iana.org/time-zones)
Bloco de notas real time online (http://dontpad.com/)
Calculadora baseado em notas (https://numbr.dev/)
Calculando especificidade CSS (https://polypane.app/css-specificity-calculator/)
Calcular dias úteis (https://www.dias-uteis.com/)
Capturar e compartilhar screenshot (https://prnt.sc/)
Compartilhar segredos (https://onetimesecret.com/)
Compilador online (https://godbolt.org/)
Comprar diagramas (https://text-to-diagram.com/)
Comprar e vender startups (https://acquire.com/)
Converter unix timestamp para datas (https://www.epochconverter.com/)
Copiar e colar dados (https://colar.app/)
Copiar sites (https://same.new/)
Cupons de desconto (https://benchpromos.com.br/, https://www.cuponomia.com.br/, https://www.pelando.com.br/)
Criar lista de links (https://link.space/, https://linktr.ee/, https://bento.me/en/home)
Criar perfil do GitHub (https://www.profileme.dev/)
Criação de apresentações (https://grid.is/, https://pitch.com/, https://sli.dev/, https://slides.com/)
Coletar ideias e bugs de aplicações/sites (https://www.pendo.io/, https://userback.io/, https://userreport.com/)
Color picker online (https://www.canva.com/colors/color-wheel/, https://coolors.co/, https://colordrop.io/, https://color.adobe.com/pt/create/color-wheel, https://fffuel.co/, https://mycolor.space/, https://paletton.com, https://primer.style/prism/, https://www.w3schools.com/colors/colors_picker.asp, https://oklch.com/, https://uicolors.app/create)
Comparação de bundles (https://bundlers.tooling.report/)
Compartilhar trechos de códigos (https://carbon.now.sh/, https://chalk.ist/, https://codeimg.io/, https://ray.so/, https://github.com/charmbracelet/freeze)
Comprar livros de desenvolvimento (https://www.packtpub.com/)
Comprar jogos com descontos (https://www.instant-gaming.com/en)
Converter moedas (https://currency.world/convert, https://dolarhoje.com/)
Criar arquivos gitignore automaticamente (http://gitignore.io/)
Criar avatars (http://avatars.adorable.io/)
Criar Diagramas e Fluxos (https://github.com/mermaid-js/mermaid, https://mermaid.live)
Criar tierlists (https://tiermaker.com/)
Criptografar SQLs (https://www.zetetic.net/sqlcipher/)
Dados sobre canais no Youtube (https://www.viewstats.com/)
Dados sobre repositórios no GitHub (https://www.gharchive.org/)
Denunciar fotos intimadas vazadas publicamente na internet (https://stopncii.org/, https://takeitdown.ncmec.org/)
Descobrir IP público (https://www.whatismyip.com/ https://whatismyipaddress.com/)
Dicas úteis sobre bibliotecas e ferramentas para dev's (https://devhints.io/)
Documentação sobre Google Analytics (https://ga-dev-tools.appspot.com/)
Encutar URLs (https://bitly.com/, Dub, https://short.io/)
Escaner bibliotecas em uso nos sites (https://bundlescanner.com/)
Ferramentas para pensar melhor em colaboração (https://untools.co/)
Free for Dev (https://github.com/ripienaar/free-for-dev)
Free Text to Speech (https://ttsmaker.com/)
Gerador de curriculos (https://resumake.io/)
Gerador de favicons (https://www.favicon.software/)
Gerador de font-clamp (https://clamp.font-size.app)
Gerador de imagens para sites (https://picsum.photos/, https://thispersondoesnotexist.com/)
Gerador de imagens para PWA (https://www.pwabuilder.com/imagegenerator)
Gestão de horas e timezones (https://time.is/)
Habilidades de desenvolvedores web de maneira visual (https://andreasbm.github.io/web-skills/)
Imagens SVG's gratuitas (https://undraw.co/illustrations)
Lista de alternativas open-source ((https://www.btw.so/open-source-alternatives)[https://www.btw.so/open-source-alternatives])
Lista de API's públicas para utilizar em projetos (https://public-apis.io/)
Lista de dinâmicas para times (http://www.funretrospectives.com/)
Lista com serviços free e open source (https://free-for.dev/#/)
Lorem ipsum para imagens (https://doodleipsum.com/, https://api.lorem.space/image?w=400&h=400)
Medir a performance de bibliotecas e frameworks client side (https://perf-track.web.app/, https://speedvitals.com/)
MRR de Startups (https://www.trustmrr.co/)
Musicas sem copyright (Artlist, AudioHero, Envato, FreeSound, OvaniSound, https://uppbeat.io/, https://www.zapsplat.com/, https://www.epidemicsound.com/)
Navegar na AST do JavaScript (https://astexplorer.net/)
Quadro branco online (https://jamboard.google.com/)
Quantidade de demissões das empresas (https://layoffs.fyi/)
Perguntas em reuniões, talks e palestras (https://dory.app/, https://www.sli.do/)
Perguntas aleatórias sobre entrevistas técnicas (https://30secondsofinterviews.org/)
Pesquisa e estado do Ágil (https://stateofagile.com/)
Placeholders de imagens online (https://placeholder.com/)
Produtos que deram certo (https://www.indiehackers.com/products)
Ranking de projetos open-source (https://ossinsight.io/collections/open-source-database/)
Rastrear pedidos (https://track.ebanx.com/)
Remover background de imagens (https://removal.ai/)
Roadmap do desenvolvedor (https://roadmap.sh/)
Ser notificado sobre mudanças em algum site (https://visualping.io/)
Templates de sites feitos com Bootstrap (https://designmodo.com/bootstrap-templates/)
Templates para slides (https://slidesgo.com/themes)
Testar HZz rodando na máquina (https://testufo.com/)
Testar especificações WCAG em sites (https://wave.webaim.org/)
Testar diferentes combinações de fontes (https://fontflipper.com/)
Testar padrões de cron (https://crontab.cronhub.io/)
Testar paleta de cores (https://realtimecolors.com/)
Testar periféricos (https://hardwaretester.com/)
Teste de conhecimento, entenda seu perfil em como gosta de aprender (http://www.cchla.ufpb.br/ccmd/aprendizagem/)
Teste de digitação (https://monkeytype.com/)
Teste de personalidade (https://www.16personalities.com/)
Traduzir textos de um idioma para outro (https://www.deepl.com/translator)
Verificar busca por palavras chaves na Google (https://keywordtool.io/)
Verificar como ficaria seu site para pessoas com deficiências visuais (https://www.toptal.com/designers/colorfilter/)
Verificar contraste de cores (https://webaim.org/resources/contrastchecker/)
Verificar horário atual no mundo (https://time.is/)
Verificar mudanças em códigos (https://www.w3docs.com/tools/code-diff/)
Verificar perda de pacotes (https://pt.packetlosstest.com/)
Veriricar portas abertas em um IP (https://www.whatismyip.com/port-scanner/)
Verificar pronuncia de palavras (https://forvo.com/, https://accenthero.com/)
Verificar suporte dos navegadores sobre acessibilidade (https://www.html5accessibility.com/)
Visualizando repositórios Git (https://git-school.github.io/visualizing-git/)
Visualizar códigos compilados (https://godbolt.org/)
Visualizar JSON como grafos (https://jsoncrack.com/, https://jsonhero.io/, https://jsontr.ee)
Visualizar sites antigos (https://web.archive.org/)
Temas e inspirações
21st (https://21st.dev)
Aceternity (https://ui.aceternity.com/)
Assetpro (https://assetpro.design/)
Awwwards (https://www.awwwards.com/)
Call to Inspiration (https://calltoinspiration.com/)
Contra (https://contra.com/)
CSS Design Awards (https://www.cssdesignawards.com/)
Dribble (https://dribbble.com/)
Landbook (https://land-book.com/)
Layers (https://layers.to/)
HTM5 UP (https://html5up.net/)
Magic UI (https://magicui.design/)
Mobbin (https://mobbin.com/)
MotionSites (https://motionsites.ai/)
OneLovePage (https://onepagelove.com/)
Refero (https://refero.design/)
Saas UI (https://saas-ui.dev/)
See Saw (https://www.seesaw.website/)
StackSorted (https://stacksorted.com/buttons)
Supahero (https://www.supahero.io/)
Tabler (https://tabler.io/admin-template)
ThemeForest (https://themeforest.net/)
UI Design Daily (https://www.uidesigndaily.com/)
UI Sources (https://www.uisources.com/)
Uplabs (https://www.uplabs.com/)
UxHack (https://uxhack.co/)
Wrappixel (https://www.wrappixel.com/)
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