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30,057 projects in the catalog.

Free Pascal, Lazarus and Delphi components, libraries and programs from GitHub, SourceForge, Codeberg, GitLab and more. Rate them, mark what looks interesting, and talk about them on their benches.

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express

Simple REST Server Framework

  • Quiet
  • Library
  • Delphi
  • GitHub
  • ★ 29

Networking

Express

Fast modern scripting engine for Free Pascal

  • Active
  • Library
  • Lazarus
  • GitHub
  • ★ 14
  • Apache-2.0

Language Tools

ExPress

  • Quiet
  • Application
  • Lazarus
  • GitHub
  • ★ 4
  • GPL-2.0

Other

Expression-Language

The Expression Language (EL) is a simple language designed to meet the needs of the presentation layer in applications.

  • Quiet
  • Library
  • Delphi
  • GitHub
  • ★ 8
  • GPL-3.0

Language Tools

Foreval

Foreval is parser, compiler and evaluator of mathematical expressions in run-time with support complex numbers. After parsing and building tree of expression is perform optimization and compiling into x86-32 instructions and returns address of compiled expression. For expressions can by finding derivatives by symbolic or numerical differentiation.

  • Active
  • Library
  • Delphi
  • GitHub
  • ★ 2
  • MIT

Science

Expression-evaluator

A Delphi simple expression evaluator with user functions and variables

  • Quiet
  • Library
  • Delphi
  • GitHub
  • ★ 22
  • Apache-2.0

Language Tools

ExPress - (Ex)ecutables' Com(press)or

A GUI Wrapper for UPX (Ultimate Packer for eXecutables). Runs on any platform that Lazarus/FPC support. Features: drag & drop, multiple files, etc.

  • Quiet
  • Application
  • Lazarus
  • SourceForge
  • GNU General Public License version 2.0 (GPLv2)

Files and Drives

math-expression-evaluator

Math expression evaluator written in Pascal using pointers.

  • Quiet
  • Library
  • Delphi
  • GitHub
  • ★ 6
  • MIT

Other

ExpressRepo

Super simple C# repository pattern with async and generics support for Entity Framework.

  • Quiet
  • Other
  • GitHub
  • ★ 1

Other

ExpressionParser

A basic math expression parser, proof of concept from back in the day...

  • Quiet
  • Library
  • Delphi
  • GitHub
  • ★ 2
  • MIT

Language Tools

Acoustic Research Tool (ART)

ART is a flexible simulation framework for wind instruments. It includes a growing library of modelling elements. So far bore discontinuities, branches, tone holes, cylindrical and conical tubes, Bessel horns and bent tubes are available for frequency domain modelling. In the time domain generic bidirectional propagation elements, scattering elements, fractional delays, convolution with reflection functions and general z-domain networks are available and can be described using MuParserX expressions. Cylindrical and conical ducts can also be defined based on their geometry. Available models and their parameters can be enumerated and combined to form simulators for complex acoustical structures. Parameters can be specified symbolically by expressions containing other parameter values or global variables. Dependencies between parameters are resolved at run time. However, MuParserX expressions are compiled at design time. Zero-delay loops are detected and reported.

  • Quiet
  • Library
  • SourceForge
  • GNU General Public License version 2.0 (GPLv2)

Science

Graph Capture

The software was designed for suitable chart creation. From text files or programs, that haven't visual charts themselves, data is passed to "Graph Capture" and plotted there. But you have to write Perl RegEx expressions to extract X and Y-values from raw data. Otherwise, you can request suitable filter templates here https://www.facebook.com/vlad.dubov.77. For making RegEx expressions short docs are also included in the program. You can find "Help: regular expressions in Perl" in the installation folder or in the program's top bar. The program can plot charts from a static file ( just drag and drop the file) or from a dynamically written file - by using a plugin that "connects" to the source. Win 32/64 7/8/10/11 and probably XP ;)

  • Application
  • SourceForge
  • Adaptive Public License

Charts and Graphs

jeans-express-shipping-system

Desktop air freight booking and administration system with cost modelling, flight matching and admin reporting. Object Pascal + MS Access. Built as my Grade 12 IT assessment (2025).

  • Active
  • Application
  • Delphi
  • GitHub
  • ★ 1
  • MIT

Reporting

JSON Expression Parser & Evaluator

An Expression Parser and Evaluator result in JSON object. Written in Pascal. 表达式的解析和求值是一个应用面非常广的功能。JSON格式因其简明、易于操作，使用面日渐广泛。本项目将表达式分析的结果存放在JS

  • Quiet
  • Library
  • SourceForge

Language Tools

delphi-markdown

. Delphi FPC This is a Pascal Delphi library that processes to markdown to HTML

  • Active
  • Package
  • Lazarus and Delphi
  • GitHub
  • ★ 230
  • BSD-3-Clause

Language Tools

3.0 from 1 member

MathParser

An expression parser and a virtual machine. A formula is compiled to a flat byte array and evaluated by a linear pass over it, with no allocation on the path of an ordinary formula. On x86-64 an optional accelerator compiles that bytecode to machine code and hands anything it declines back to the interpreter, so an answer is never fast but wrong. Results are cached by shape: once 2 + 3 has been compiled, 5 + 7 reuses the same script and only writes the numbers into a copy. 163 functions to call and 249 names in the table, your own functions and variables bound by address, symbolic differentiation. The Lazarus parser packages require FCL and define NOFORMS and NOGRAPHICS, so they install without LCL. WebAssembly uses a separate console configuration. Two units ask for more at their defaults, Thread through Application.HandleException and BlobManager through TGraphic; drop the defines and add the LCL to the package if you want them.

  • Active
  • Package
  • Lazarus and Delphi
  • GitHub
  • ★ 14
  • MIT

Language Tools In the Online Package Manager

Syntax-Tree-Evaluator

A mathematical syntax tree evaluation library for mathematical and logical program expressions. Encode expressions and programs into a tree for use in Genetic Programming.

  • Quiet
  • Library
  • GitHub
  • ★ 2
  • MIT

Language Tools

DAXLIB-TP

Bibliothèque de compatibilité avec DAX (Data Analysis Expressions) écrit en Turbo Pascal

  • Active
  • Library
  • GitHub
  • ★ 1
  • MIT

Language Tools

EstSearchDialogs

EstSearchDialogs is a Delphi component set to create powerful search functionality in your application by building a SQL statement and visualy configuring how your user may search on the query result. Use BDE, DB Express, ADO, IB Express, Zeos or custom.

  • Quiet
  • Library
  • Delphi
  • SourceForge
  • Mozilla Public License 1.1 (MPL 1.1)

Dialogs Database

PasExpressParser

this is Express parser unit support Delphi and Lazaurs

  • Quiet
  • Library
  • Lazarus and Delphi
  • GitHub
  • ★ 7

Language Tools

fatexpression

FatExpression is python class used for calculating text-presented expressions

  • Quiet
  • Other
  • GitHub
  • ★ 4
  • BSD-3-Clause

Other

LExpression

Small pascal library for handling and evaluating expressions.

  • Quiet
  • Library
  • GitHub
  • ★ 1
  • MIT

Language Tools

MTExpress

Multi Tier Express Project. This is a Server and Client Packages for database applications. Server is in Lazarus to support all platform.

  • Quiet
  • Package
  • Lazarus
  • GitHub
  • ★ 1
  • Apache-2.0

Database

zExpression

脚本与编译器内部的语法引擎内核，也是一种op内核，zExpression可以轻松实现自己的脚本引擎

  • Quiet
  • Library
  • Lazarus and Delphi
  • GitHub
  • ★ 47

Language Tools

TRegExpr

Regular expressions (regex), pascal.

  • Active
  • Library
  • Lazarus and Delphi
  • GitHub
  • ★ 193
  • MIT

Language Tools

flre

FLRE - Fast Light Regular Expressions - A fast light regular expression library

  • Active
  • Library
  • Lazarus
  • GitHub
  • ★ 104
  • LGPL-2.1

Language Tools

Delphi_Utils_Library

A library with some useful utilities for your Delphi Apps.

  • Active
  • Library
  • Delphi
  • GitHub
  • ★ 37
  • BSD-3-Clause-Clear

Other

opcb-object-pascal-component-builder

OPCB – Object Pascal Component Builder A library for fluent creation and configuration of components in Delphi and Lazarus. Enables expressive, hierarchical, and reusable runtime UI construction. Developed by Fabiano Arndt. Copyright © 2025 Fabiano Arndt

  • Active
  • Library
  • Lazarus and Delphi
  • GitHub
  • ★ 33
  • Apache-2.0

GUI containers

PEG

"Parsing Expression Grammars" (PEG) for Delphi / Pascal

  • Quiet
  • Library
  • Delphi
  • GitHub
  • ★ 21
  • MIT

Language Tools

brre

yet another efficient, principled regular expression library

  • Active
  • Library
  • Delphi
  • GitHub
  • ★ 18

Language Tools

DimsaMathParser

Parser for Math Expression with easy adding of new functions and operands. Written on Delphi XE5

  • Quiet
  • Library
  • Delphi
  • GitHub
  • ★ 18
  • GPL-2.0

Language Tools

ExprParser

Simple, but flexible expression parser for Delphi. Forked from JvExprParser.

  • Active
  • Library
  • Delphi
  • GitHub
  • ★ 16

Language Tools

libpaspcre2

libPasPCRE2 is delphi and object pascal bindings for Perl-compatible Regular Expressions library (PCRE2). Library is a set of functions that implement regular expression pattern matching using the same syntax and semantics as Perl 5.

  • Archived
  • Library
  • Delphi
  • GitHub
  • ★ 12
  • GPL-3.0

Bindings

Debug-with-CodeSite

This is a RAD Studio wizard / expert / plug-in which allow you to right click on an identifier in the code editor and add a breakpoint which contains a CodeSite.Send() evaluation expression so you can debug code with CodeSite without having to alter the underlying code (useful for debugging RTL and the VCL).

  • Quiet
  • Library
  • Delphi
  • GitHub
  • ★ 11

Lazarus IDE plugins

PBFMapRenderer

Render Mapbox vector tiles (MVT/PBF) from MBTiles to a Delphi TCanvas — Mapbox GL style.json, expression engine, label placement, GDI+/Skia backends, zero runtime dependencies.

  • Active
  • Library
  • Delphi
  • GitHub
  • ★ 10
  • MIT

Graphics

SuperCSV

Open a large CSV file and the CSV open source code that supports expression filtering

  • Quiet
  • Application
  • Lazarus
  • GitHub
  • ★ 10

Database

CronSim4Delphi

Delphi porting of Cron Sim(ulator), a cron expression parser

  • Active
  • Library
  • Delphi
  • GitHub
  • ★ 7
  • Apache-2.0

Date and Time

PersianStemmer

A New Rule-Based Persian Stemmer Using Regular Expression

  • Quiet
  • Library
  • Delphi
  • GitHub
  • ★ 7
  • GPL-2.0

Science

RunFormula

A lightweight open-source unit-aware math and physics scripting engine for FreePascal and Lazarus

  • Active
  • Library
  • Lazarus
  • GitHub
  • ★ 7
  • MIT

Language Tools

StringFilter

A text filtering program developed by Delphi mainly uses the regular expression function of. Can be used to process text.

  • Quiet
  • Application
  • Delphi
  • GitHub
  • ★ 7

Edit and Memos

PerlRegEx

a Delphi class for user Regular Expression,

  • Quiet
  • Library
  • Delphi
  • GitHub
  • ★ 6

Other

fb_regex

Firebird UDR library for regular expressions

  • Active
  • Library
  • Delphi
  • GitHub
  • ★ 5

Database

Projeto-Athena

Enterprise management system for controlling employees, machinery, and documents. Built with a Node.js/MongoDB REST API backend and a cross-platform client application in Delphi FMX.

  • Active
  • Application
  • Delphi
  • GitHub
  • ★ 5
  • MIT

Applications

BioSynth

A terminal-based bio-hacking simulation. Master Regular Expressions (RegEx) to isolate, stabilize, and cure pathogens in a real-time 3D environment before the system breaches.

  • Active
  • Application
  • Lazarus
  • GitHub
  • ★ 4
  • MIT

Games and Game Engines