Tabteca

Tabteca is a hand-curated library of 115 services that offer genuinely free plans for developers, organized into 14 technical categories, and its distinguishing habit is honesty about limits. Every listing states what the free tier actually includes, which ones demand a credit card, and which 16 have open-source versions, so you stop discovering the catch after signup. There is no account wall and no payment gate on the directory itself. The project also ships a companion app that saves groups of browser tabs to your account and restores the whole session in a different browser, which pairs naturally with research-heavy development work. The site is in Spanish, which reads as a deliberate bet on an underserved language market rather than an oversight, and the writing is refreshingly direct. If you bootstrap products on a zero budget, this is a better starting point than the usual English free-tier roundups because the limits are the actual product data here.